SlideShare a Scribd company logo
1 of 51
Download to read offline
Usable Software Design
A Talk by Alex Bolboaca
http://www.nasa.gov/sites/default/files/thumbnails/image/iss043e124426.jpg
My belief:
YOU Deserve Better!
Naomi Weast
Actress, not a programmer
https://plus.google.com/110657773112027365790/posts
It reminds me of something else
Jacques Carelman
Artist, creator of “The Catalogue of Impossible Objects” in the 60s
http://www.patakosmos.com/wp-content/uploads/2013/09/RDA00147250.jpg
Coffee pot for masochists
Catalogue of Impossible Objects by Jacques Carelman
http://impossibleobjects.com/catalogue/coffeepot-for-masochists.html
Absorbent Bottle
Catalogue of Impossible Objects by Jacques Carelman
http://impossibleobjects.com/catalogue/absorbent-bottle.html
Siamese Hammers
Catalogue of Impossible Objects by Jacques Carelman
http://impossibleobjects.com/catalogue/siamese-hammers.html
It reminds me of something I read in a book ...
Donald A. Norman
Author of “The Design of Everyday Things”
http://www.jnd.org/NNg-Photographs/Photo1.jpg
“It is the duty of
machines and those
who design them to
understand people.
It is not our duty to
understand the
arbitrary,
meaningless dictates
of machines.”
User Centric Design Process by UXPA
Revolution started by Donald A. Norman's book
http://uxmastery.com/what-does-a-user-centred-design-process-look-like/
All designs have an user.
Who is the user of software
design?
Can't be the end user.
Only one answer: the developer is
the user of software design.
So, then, developer-centric
software design is a thing?
How about “Usable Software
Design”?
You Are The User: Changing Code
●
Figure out what you need to change
●
Navigate there
●
Read the code, tests, documentation, comments
●
Write/change code, write/change tests
●
Refactor
●
Build
●
Validate
●
Integrate
Figure Out What To Change
●
How easy can you reason about the runtime
behavior based on the static structure of the
code?
Example: Namespaces
Example: Modules
Is Your Design Easy to Navigate?
●
What module / namespace to look in?
– See previous examples
●
How is that thing named?
– Should be Consistent, Memorable, Precise
●
How deep is the inheritance tree?
Example: Consistency
Example: Modules APIs
This is just the beginning
What is Usable Software Design?
What is Usable Software Design?
Usable Software Design is any code structure
that exhibits design qualities similar to usability
5 Design Qualities of Usability
1. Learnability
2. Efficiency
3. Memorability
4. Errors
5. Satisfaction
http://www.nngroup.com/articles/usability-101-introduction-to-
usability/
How easy it is to accomplish basic tasks the first
time you're using the design?
How quickly can you perform a task once you've
learned the design?
When you go back to the design after a period of
not using it, how easy is to become efficient
again?
How many errors do you make, how severe are
they and how can you recover from them?
How pleasant it is to use the design?
How to Improve The Usability of Software
Design?
Developer Persona For Your Team
●
Kernel Developer
●
Java Enterprise Developer
●
Rails Developer
●
C/C++ Embedded Developer
●
Android Developer
●
Front-end Javascript + html + CSS developer
●
Etc.
Each persona
has different
needs.
Usability
depends on the
user!
Example of Team Agreement
Usable Software Design means to us that:
1. It is written for developers to read
2. It is easy to find where to modify the code
3. Any modification has a minimal ripple-effect
4. It is easy AND fast to validate that we did the right thing
5. We don’t have to do similar modifications in several places
Usable Software Design – A Federating Concep
t
by Johan Martinsson
Next Step: Practices
“It is written for developers to read”
=> coding guidelines, clean code etc.
“It is easy to find where to modify the code”
=> navigability, consistency etc.
“Any modification has a minimal ripple effect”
=> follow Open Closed Principle, Single Responsibility Principle
etc.
Specific practices for Usable Software Design?
(Incomplete list)
1. Learnability
How easy is it for users to accomplish basic tasks the first
time they encounter the design?
Hints: Design For Learnability
Code structure that shows what the application does
Consistency
Minimal Surprise
Use Clearly Defined Modules With Clear APIs
Readability / Clean Code
Navigability
Add Usage examples – tests / comments etc
Test Learnability
Measure how long it takes for developers
outside your team to understand the purpose of a
class with as little help as possible.
2. Efficiency
Once users have learned the design, how quickly can they
perform tasks?
Hints: Design For Efficiency
Use code constructs the whole team understands
Consistency
Fast Validation
Test Efficiency
Retro question: “what slowed you down in the
past two weeks?”
Measure how long it takes for developers to
finish typical tasks (not simple, but typical)
3. Memorability
When you go back to the design after a period of not using it,
how easy is to become efficient again?
Memorability ≈ Efficiency + Learnability
+ The style is internalized
4. Errors
How many errors do you make?
How severe are these errors?
How easily can they recover from the errors?
Hints: Design For Mistake Proofing
It's the system's fault
Write automated tests
Eliminate exceptions
Pass mandatory arguments to constructor
(more difficult when using Dependency Injection libraries)
Avoid Primitive Obsession
Principle of Minimum Surprise
Example: TicTacToe
Mistake-prone
Design
Mistake-proof Design
Test Mistake-Proofing
How many bugs do we have?
What is the main cause of the bugs?
(remember, it's typically in the design)
How can we change the design to avoid it?
4. Satisfaction
How pleasant is it to use the design?
Hints: Design For Satisfaction
Strictly personal, but relevant
Test Satisfaction
What parts of the system are unpleasant to use?
How can we change them to be more pleasant?
What To Tell Managers
Usable Software Design has the potential to bring
four economical benefits:
●
Faster integration of new developers in the team
(learnability)
●
Faster time to implement typical (not simple) tasks
(efficiency)
●
Making less mistakes (mistake-proofing)
●
Feeling more motivated (satisfaction)
My belief:
YOU Deserve Better!
Recap
●
The developer is the user of software design
●
Usable software design means code structure that
exhibits the qualities of usability: Learnability, Efficiency,
Memorability, Error Treatment and Satisfaction
●
Define the personas of your team
●
Create a team agreement
●
Start applying practices that help the agreement
●
This is just the beginning
Q&A
“The important
thing is
not to stop

More Related Content

What's hot

Always ready for release by Bogdan Costea
Always ready for release by Bogdan CosteaAlways ready for release by Bogdan Costea
Always ready for release by Bogdan CosteaBosnia Agile
 
Welcome to the blue team! How building a better hacker accidentally built a b...
Welcome to the blue team! How building a better hacker accidentally built a b...Welcome to the blue team! How building a better hacker accidentally built a b...
Welcome to the blue team! How building a better hacker accidentally built a b...Casey Ellis
 
Justin Ison
Justin IsonJustin Ison
Justin IsonCodeFest
 
Oscon 2013 -Your OSS Project Is now served
Oscon 2013 -Your OSS Project Is now servedOscon 2013 -Your OSS Project Is now served
Oscon 2013 -Your OSS Project Is now servedUri Cohen
 
The State of the Web - Helsinki meetup
The State of the Web - Helsinki meetupThe State of the Web - Helsinki meetup
The State of the Web - Helsinki meetupChristian Heilmann
 
Creating Living Style Guides to Improve Performance
Creating Living Style Guides to Improve PerformanceCreating Living Style Guides to Improve Performance
Creating Living Style Guides to Improve PerformanceNicole Sullivan
 
41631 lecture 6 pt1 prototyping
41631 lecture 6 pt1   prototyping41631 lecture 6 pt1   prototyping
41631 lecture 6 pt1 prototypingTom Howard
 
Enterprise Strength Mobile JavaScript
Enterprise Strength Mobile JavaScriptEnterprise Strength Mobile JavaScript
Enterprise Strength Mobile JavaScriptTroy Miles
 
Making ES6 available to all with ChakraCore
Making ES6 available to all with ChakraCoreMaking ES6 available to all with ChakraCore
Making ES6 available to all with ChakraCoreChristian Heilmann
 
Moore vs. May - everything is faster and better: we can fix that
Moore vs. May - everything is faster and better: we can fix thatMoore vs. May - everything is faster and better: we can fix that
Moore vs. May - everything is faster and better: we can fix thatChristian Heilmann
 
Responsive, adaptive and responsible - keynote at NebraskaJS
Responsive, adaptive and responsible - keynote at NebraskaJSResponsive, adaptive and responsible - keynote at NebraskaJS
Responsive, adaptive and responsible - keynote at NebraskaJSChristian Heilmann
 
Resisting The Feature Creature
Resisting The Feature CreatureResisting The Feature Creature
Resisting The Feature CreatureChristian Heilmann
 
On premise cross-browser testing
On premise cross-browser testingOn premise cross-browser testing
On premise cross-browser testingDaniel Herken
 
Lightweight introduction to Scrum
Lightweight introduction to ScrumLightweight introduction to Scrum
Lightweight introduction to ScrumFlorent Biville
 
DevOps for Drupal: Why We Cook With Chef
DevOps for Drupal: Why We Cook With ChefDevOps for Drupal: Why We Cook With Chef
DevOps for Drupal: Why We Cook With ChefPromet Source
 
Matt Heusser - Keynote - Cool New Things... and some old ones too
Matt Heusser - Keynote - Cool New Things... and some old ones tooMatt Heusser - Keynote - Cool New Things... and some old ones too
Matt Heusser - Keynote - Cool New Things... and some old ones tooQA or the Highway
 
9 Productive Tips to Work Faster
9 Productive Tips to Work Faster9 Productive Tips to Work Faster
9 Productive Tips to Work FasterShore Labs
 
Continuous Testing With React Storybook & WebdriverIO
Continuous Testing With React Storybook & WebdriverIOContinuous Testing With React Storybook & WebdriverIO
Continuous Testing With React Storybook & WebdriverIOJosh Cypher
 
Most valuable software design principles
Most valuable software design principlesMost valuable software design principles
Most valuable software design principlesJeroen Hildering
 

What's hot (20)

Always ready for release by Bogdan Costea
Always ready for release by Bogdan CosteaAlways ready for release by Bogdan Costea
Always ready for release by Bogdan Costea
 
Welcome to the blue team! How building a better hacker accidentally built a b...
Welcome to the blue team! How building a better hacker accidentally built a b...Welcome to the blue team! How building a better hacker accidentally built a b...
Welcome to the blue team! How building a better hacker accidentally built a b...
 
Justin Ison
Justin IsonJustin Ison
Justin Ison
 
Oscon 2013 -Your OSS Project Is now served
Oscon 2013 -Your OSS Project Is now servedOscon 2013 -Your OSS Project Is now served
Oscon 2013 -Your OSS Project Is now served
 
Keep DevOps Hip
Keep DevOps HipKeep DevOps Hip
Keep DevOps Hip
 
The State of the Web - Helsinki meetup
The State of the Web - Helsinki meetupThe State of the Web - Helsinki meetup
The State of the Web - Helsinki meetup
 
Creating Living Style Guides to Improve Performance
Creating Living Style Guides to Improve PerformanceCreating Living Style Guides to Improve Performance
Creating Living Style Guides to Improve Performance
 
41631 lecture 6 pt1 prototyping
41631 lecture 6 pt1   prototyping41631 lecture 6 pt1   prototyping
41631 lecture 6 pt1 prototyping
 
Enterprise Strength Mobile JavaScript
Enterprise Strength Mobile JavaScriptEnterprise Strength Mobile JavaScript
Enterprise Strength Mobile JavaScript
 
Making ES6 available to all with ChakraCore
Making ES6 available to all with ChakraCoreMaking ES6 available to all with ChakraCore
Making ES6 available to all with ChakraCore
 
Moore vs. May - everything is faster and better: we can fix that
Moore vs. May - everything is faster and better: we can fix thatMoore vs. May - everything is faster and better: we can fix that
Moore vs. May - everything is faster and better: we can fix that
 
Responsive, adaptive and responsible - keynote at NebraskaJS
Responsive, adaptive and responsible - keynote at NebraskaJSResponsive, adaptive and responsible - keynote at NebraskaJS
Responsive, adaptive and responsible - keynote at NebraskaJS
 
Resisting The Feature Creature
Resisting The Feature CreatureResisting The Feature Creature
Resisting The Feature Creature
 
On premise cross-browser testing
On premise cross-browser testingOn premise cross-browser testing
On premise cross-browser testing
 
Lightweight introduction to Scrum
Lightweight introduction to ScrumLightweight introduction to Scrum
Lightweight introduction to Scrum
 
DevOps for Drupal: Why We Cook With Chef
DevOps for Drupal: Why We Cook With ChefDevOps for Drupal: Why We Cook With Chef
DevOps for Drupal: Why We Cook With Chef
 
Matt Heusser - Keynote - Cool New Things... and some old ones too
Matt Heusser - Keynote - Cool New Things... and some old ones tooMatt Heusser - Keynote - Cool New Things... and some old ones too
Matt Heusser - Keynote - Cool New Things... and some old ones too
 
9 Productive Tips to Work Faster
9 Productive Tips to Work Faster9 Productive Tips to Work Faster
9 Productive Tips to Work Faster
 
Continuous Testing With React Storybook & WebdriverIO
Continuous Testing With React Storybook & WebdriverIOContinuous Testing With React Storybook & WebdriverIO
Continuous Testing With React Storybook & WebdriverIO
 
Most valuable software design principles
Most valuable software design principlesMost valuable software design principles
Most valuable software design principles
 

Similar to Alex Bolboacă: Usable Software Design at I T.A.K.E. Unconference 2015

Beyond Staggered Sprints: Integrating User Experience and Agile
Beyond Staggered Sprints: Integrating User Experience and AgileBeyond Staggered Sprints: Integrating User Experience and Agile
Beyond Staggered Sprints: Integrating User Experience and AgileJeff Gothelf
 
Planning JavaScript and Ajax for larger teams
Planning JavaScript and Ajax for larger teamsPlanning JavaScript and Ajax for larger teams
Planning JavaScript and Ajax for larger teamsChristian Heilmann
 
Front-End Modernization for Mortals
Front-End Modernization for MortalsFront-End Modernization for Mortals
Front-End Modernization for Mortalscgack
 
Front end-modernization
Front end-modernizationFront end-modernization
Front end-modernizationdevObjective
 
3stages Wdn08 V3
3stages Wdn08 V33stages Wdn08 V3
3stages Wdn08 V3Boris Mann
 
Professional web development with libraries
Professional web development with librariesProfessional web development with libraries
Professional web development with librariesChristian Heilmann
 
PVS-Studio and CppCat: An Interview with Andrey Karpov, the Project CTO and D...
PVS-Studio and CppCat: An Interview with Andrey Karpov, the Project CTO and D...PVS-Studio and CppCat: An Interview with Andrey Karpov, the Project CTO and D...
PVS-Studio and CppCat: An Interview with Andrey Karpov, the Project CTO and D...Andrey Karpov
 
War of the Machines: PVS-Studio vs. TensorFlow
War of the Machines: PVS-Studio vs. TensorFlowWar of the Machines: PVS-Studio vs. TensorFlow
War of the Machines: PVS-Studio vs. TensorFlowPVS-Studio
 
Reactive Microservice Architecture with Groovy and Grails
Reactive Microservice Architecture with Groovy and GrailsReactive Microservice Architecture with Groovy and Grails
Reactive Microservice Architecture with Groovy and GrailsSteve Pember
 
Dev-Centered UX (UX Week 2014)
Dev-Centered UX (UX Week 2014)Dev-Centered UX (UX Week 2014)
Dev-Centered UX (UX Week 2014)Anders Ramsay
 
Resilient Enterprise Design (Craig Villamor at Enterprise UX 2017)
Resilient Enterprise Design (Craig Villamor at Enterprise UX 2017)Resilient Enterprise Design (Craig Villamor at Enterprise UX 2017)
Resilient Enterprise Design (Craig Villamor at Enterprise UX 2017)Rosenfeld Media
 
Building an Open Source iOS app: lessons learned
Building an Open Source iOS app: lessons learnedBuilding an Open Source iOS app: lessons learned
Building an Open Source iOS app: lessons learnedWojciech Koszek
 
The Taming Of The Code
The Taming Of The CodeThe Taming Of The Code
The Taming Of The CodeAlan Stevens
 
Pilot Tech Talk #10 — Practical automation by Kamil Cholewiński
Pilot Tech Talk #10 — Practical automation by Kamil CholewińskiPilot Tech Talk #10 — Practical automation by Kamil Cholewiński
Pilot Tech Talk #10 — Practical automation by Kamil CholewińskiPilot
 
Full stack conference talk slides
Full stack conference talk slidesFull stack conference talk slides
Full stack conference talk slidesSameer Al-Sakran
 

Similar to Alex Bolboacă: Usable Software Design at I T.A.K.E. Unconference 2015 (20)

Usable Software Design
Usable Software DesignUsable Software Design
Usable Software Design
 
Beyond Staggered Sprints: Integrating User Experience and Agile
Beyond Staggered Sprints: Integrating User Experience and AgileBeyond Staggered Sprints: Integrating User Experience and Agile
Beyond Staggered Sprints: Integrating User Experience and Agile
 
Planning JavaScript and Ajax for larger teams
Planning JavaScript and Ajax for larger teamsPlanning JavaScript and Ajax for larger teams
Planning JavaScript and Ajax for larger teams
 
Front-End Modernization for Mortals
Front-End Modernization for MortalsFront-End Modernization for Mortals
Front-End Modernization for Mortals
 
Front end-modernization
Front end-modernizationFront end-modernization
Front end-modernization
 
Front end-modernization
Front end-modernizationFront end-modernization
Front end-modernization
 
Designer vs Developer
Designer vs DeveloperDesigner vs Developer
Designer vs Developer
 
3stages Wdn08 V3
3stages Wdn08 V33stages Wdn08 V3
3stages Wdn08 V3
 
Professional web development with libraries
Professional web development with librariesProfessional web development with libraries
Professional web development with libraries
 
Debugging
DebuggingDebugging
Debugging
 
PVS-Studio and CppCat: An Interview with Andrey Karpov, the Project CTO and D...
PVS-Studio and CppCat: An Interview with Andrey Karpov, the Project CTO and D...PVS-Studio and CppCat: An Interview with Andrey Karpov, the Project CTO and D...
PVS-Studio and CppCat: An Interview with Andrey Karpov, the Project CTO and D...
 
War of the Machines: PVS-Studio vs. TensorFlow
War of the Machines: PVS-Studio vs. TensorFlowWar of the Machines: PVS-Studio vs. TensorFlow
War of the Machines: PVS-Studio vs. TensorFlow
 
Reactive Microservice Architecture with Groovy and Grails
Reactive Microservice Architecture with Groovy and GrailsReactive Microservice Architecture with Groovy and Grails
Reactive Microservice Architecture with Groovy and Grails
 
Agile
AgileAgile
Agile
 
Dev-Centered UX (UX Week 2014)
Dev-Centered UX (UX Week 2014)Dev-Centered UX (UX Week 2014)
Dev-Centered UX (UX Week 2014)
 
Resilient Enterprise Design (Craig Villamor at Enterprise UX 2017)
Resilient Enterprise Design (Craig Villamor at Enterprise UX 2017)Resilient Enterprise Design (Craig Villamor at Enterprise UX 2017)
Resilient Enterprise Design (Craig Villamor at Enterprise UX 2017)
 
Building an Open Source iOS app: lessons learned
Building an Open Source iOS app: lessons learnedBuilding an Open Source iOS app: lessons learned
Building an Open Source iOS app: lessons learned
 
The Taming Of The Code
The Taming Of The CodeThe Taming Of The Code
The Taming Of The Code
 
Pilot Tech Talk #10 — Practical automation by Kamil Cholewiński
Pilot Tech Talk #10 — Practical automation by Kamil CholewińskiPilot Tech Talk #10 — Practical automation by Kamil Cholewiński
Pilot Tech Talk #10 — Practical automation by Kamil Cholewiński
 
Full stack conference talk slides
Full stack conference talk slidesFull stack conference talk slides
Full stack conference talk slides
 

More from Mozaic Works

Agile Retrospectives
Agile RetrospectivesAgile Retrospectives
Agile RetrospectivesMozaic Works
 
Developer Experience to Testing
Developer Experience to TestingDeveloper Experience to Testing
Developer Experience to TestingMozaic Works
 
Story mapping: build better products with a happier team
Story mapping: build better products with a happier teamStory mapping: build better products with a happier team
Story mapping: build better products with a happier teamMozaic Works
 
Andrea Mocci: Beautiful Design, Beautiful Coding at I T.A.K.E. Unconference 2015
Andrea Mocci: Beautiful Design, Beautiful Coding at I T.A.K.E. Unconference 2015Andrea Mocci: Beautiful Design, Beautiful Coding at I T.A.K.E. Unconference 2015
Andrea Mocci: Beautiful Design, Beautiful Coding at I T.A.K.E. Unconference 2015Mozaic Works
 
Ionuț G. Stan - Let’s write a type checker at I T.A.K.E. Unconference 2015
Ionuț G. Stan - Let’s write a type checker at I T.A.K.E. Unconference 2015Ionuț G. Stan - Let’s write a type checker at I T.A.K.E. Unconference 2015
Ionuț G. Stan - Let’s write a type checker at I T.A.K.E. Unconference 2015Mozaic Works
 
Cyrille Martraire: Living Documentation Jumpstart at I T.A.K.E. Unconference ...
Cyrille Martraire: Living Documentation Jumpstart at I T.A.K.E. Unconference ...Cyrille Martraire: Living Documentation Jumpstart at I T.A.K.E. Unconference ...
Cyrille Martraire: Living Documentation Jumpstart at I T.A.K.E. Unconference ...Mozaic Works
 
Cyrille Martraire: Monoids, Monoids Everywhere! at I T.A.K.E. Unconference 2015
Cyrille Martraire: Monoids, Monoids Everywhere! at I T.A.K.E. Unconference 2015Cyrille Martraire: Monoids, Monoids Everywhere! at I T.A.K.E. Unconference 2015
Cyrille Martraire: Monoids, Monoids Everywhere! at I T.A.K.E. Unconference 2015Mozaic Works
 
Andrei Petcu: Rocket vs Docker: Battle for the Linux Container at I T.A.K.E. ...
Andrei Petcu: Rocket vs Docker: Battle for the Linux Container at I T.A.K.E. ...Andrei Petcu: Rocket vs Docker: Battle for the Linux Container at I T.A.K.E. ...
Andrei Petcu: Rocket vs Docker: Battle for the Linux Container at I T.A.K.E. ...Mozaic Works
 
Simon Brown: Software Architecture as Code at I T.A.K.E. Unconference 2015
Simon Brown: Software Architecture as Code at I T.A.K.E. Unconference 2015Simon Brown: Software Architecture as Code at I T.A.K.E. Unconference 2015
Simon Brown: Software Architecture as Code at I T.A.K.E. Unconference 2015Mozaic Works
 
Patroklos Papapetrou: How to Boost Development Team’s Speed at I T.A.K.E. Unc...
Patroklos Papapetrou: How to Boost Development Team’s Speed at I T.A.K.E. Unc...Patroklos Papapetrou: How to Boost Development Team’s Speed at I T.A.K.E. Unc...
Patroklos Papapetrou: How to Boost Development Team’s Speed at I T.A.K.E. Unc...Mozaic Works
 
Patroklos Papapetrou: Holding Down Your Technical Debt With SonarQube at I T....
Patroklos Papapetrou: Holding Down Your Technical Debt With SonarQube at I T....Patroklos Papapetrou: Holding Down Your Technical Debt With SonarQube at I T....
Patroklos Papapetrou: Holding Down Your Technical Debt With SonarQube at I T....Mozaic Works
 
Robert Mircea & Virgil Chereches: Our Journey To Continuous Delivery at I T.A...
Robert Mircea & Virgil Chereches: Our Journey To Continuous Delivery at I T.A...Robert Mircea & Virgil Chereches: Our Journey To Continuous Delivery at I T.A...
Robert Mircea & Virgil Chereches: Our Journey To Continuous Delivery at I T.A...Mozaic Works
 
James Lewis: Microservices - Systems That Are #neverdone at I T.A.K.E. Unconf...
James Lewis: Microservices - Systems That Are #neverdone at I T.A.K.E. Unconf...James Lewis: Microservices - Systems That Are #neverdone at I T.A.K.E. Unconf...
James Lewis: Microservices - Systems That Are #neverdone at I T.A.K.E. Unconf...Mozaic Works
 
Flavius Ștef: Big Rewrites Without Big Risks at I T.A.K.E. Unconference
Flavius Ștef: Big Rewrites Without Big Risks at I T.A.K.E. UnconferenceFlavius Ștef: Big Rewrites Without Big Risks at I T.A.K.E. Unconference
Flavius Ștef: Big Rewrites Without Big Risks at I T.A.K.E. UnconferenceMozaic Works
 
Adi Bolboacă: Architecture For Disaster Resistant Systems at I T.A.K.E. Unco...
Adi Bolboacă: Architecture For Disaster Resistant Systems at I T.A.K.E. Unco...Adi Bolboacă: Architecture For Disaster Resistant Systems at I T.A.K.E. Unco...
Adi Bolboacă: Architecture For Disaster Resistant Systems at I T.A.K.E. Unco...Mozaic Works
 
Alex Bolboacă: Why You Should Start Using Docker at I T.A.K.E. Unconference ...
Alex Bolboacă: Why You Should Start Using Docker at I T.A.K.E. Unconference ...Alex Bolboacă: Why You Should Start Using Docker at I T.A.K.E. Unconference ...
Alex Bolboacă: Why You Should Start Using Docker at I T.A.K.E. Unconference ...Mozaic Works
 
Svetlana Mukhina: Metrics That Bring Value at I T.A.K.E. Unconference 2015
Svetlana Mukhina: Metrics That Bring Value at I T.A.K.E. Unconference 2015Svetlana Mukhina: Metrics That Bring Value at I T.A.K.E. Unconference 2015
Svetlana Mukhina: Metrics That Bring Value at I T.A.K.E. Unconference 2015Mozaic Works
 
Aki Salmi: Object Oriented Views at I T.A.K.E. Unconference 2015
Aki Salmi: Object Oriented Views at I T.A.K.E. Unconference 2015Aki Salmi: Object Oriented Views at I T.A.K.E. Unconference 2015
Aki Salmi: Object Oriented Views at I T.A.K.E. Unconference 2015Mozaic Works
 
Stefan Kanev: Clojure, ClojureScript and Why They're Awesome at I T.A.K.E. Un...
Stefan Kanev: Clojure, ClojureScript and Why They're Awesome at I T.A.K.E. Un...Stefan Kanev: Clojure, ClojureScript and Why They're Awesome at I T.A.K.E. Un...
Stefan Kanev: Clojure, ClojureScript and Why They're Awesome at I T.A.K.E. Un...Mozaic Works
 
Igor Popov: Mutation Testing at I T.A.K.E. Unconference 2015
Igor Popov: Mutation Testing at I T.A.K.E. Unconference 2015Igor Popov: Mutation Testing at I T.A.K.E. Unconference 2015
Igor Popov: Mutation Testing at I T.A.K.E. Unconference 2015Mozaic Works
 

More from Mozaic Works (20)

Agile Retrospectives
Agile RetrospectivesAgile Retrospectives
Agile Retrospectives
 
Developer Experience to Testing
Developer Experience to TestingDeveloper Experience to Testing
Developer Experience to Testing
 
Story mapping: build better products with a happier team
Story mapping: build better products with a happier teamStory mapping: build better products with a happier team
Story mapping: build better products with a happier team
 
Andrea Mocci: Beautiful Design, Beautiful Coding at I T.A.K.E. Unconference 2015
Andrea Mocci: Beautiful Design, Beautiful Coding at I T.A.K.E. Unconference 2015Andrea Mocci: Beautiful Design, Beautiful Coding at I T.A.K.E. Unconference 2015
Andrea Mocci: Beautiful Design, Beautiful Coding at I T.A.K.E. Unconference 2015
 
Ionuț G. Stan - Let’s write a type checker at I T.A.K.E. Unconference 2015
Ionuț G. Stan - Let’s write a type checker at I T.A.K.E. Unconference 2015Ionuț G. Stan - Let’s write a type checker at I T.A.K.E. Unconference 2015
Ionuț G. Stan - Let’s write a type checker at I T.A.K.E. Unconference 2015
 
Cyrille Martraire: Living Documentation Jumpstart at I T.A.K.E. Unconference ...
Cyrille Martraire: Living Documentation Jumpstart at I T.A.K.E. Unconference ...Cyrille Martraire: Living Documentation Jumpstart at I T.A.K.E. Unconference ...
Cyrille Martraire: Living Documentation Jumpstart at I T.A.K.E. Unconference ...
 
Cyrille Martraire: Monoids, Monoids Everywhere! at I T.A.K.E. Unconference 2015
Cyrille Martraire: Monoids, Monoids Everywhere! at I T.A.K.E. Unconference 2015Cyrille Martraire: Monoids, Monoids Everywhere! at I T.A.K.E. Unconference 2015
Cyrille Martraire: Monoids, Monoids Everywhere! at I T.A.K.E. Unconference 2015
 
Andrei Petcu: Rocket vs Docker: Battle for the Linux Container at I T.A.K.E. ...
Andrei Petcu: Rocket vs Docker: Battle for the Linux Container at I T.A.K.E. ...Andrei Petcu: Rocket vs Docker: Battle for the Linux Container at I T.A.K.E. ...
Andrei Petcu: Rocket vs Docker: Battle for the Linux Container at I T.A.K.E. ...
 
Simon Brown: Software Architecture as Code at I T.A.K.E. Unconference 2015
Simon Brown: Software Architecture as Code at I T.A.K.E. Unconference 2015Simon Brown: Software Architecture as Code at I T.A.K.E. Unconference 2015
Simon Brown: Software Architecture as Code at I T.A.K.E. Unconference 2015
 
Patroklos Papapetrou: How to Boost Development Team’s Speed at I T.A.K.E. Unc...
Patroklos Papapetrou: How to Boost Development Team’s Speed at I T.A.K.E. Unc...Patroklos Papapetrou: How to Boost Development Team’s Speed at I T.A.K.E. Unc...
Patroklos Papapetrou: How to Boost Development Team’s Speed at I T.A.K.E. Unc...
 
Patroklos Papapetrou: Holding Down Your Technical Debt With SonarQube at I T....
Patroklos Papapetrou: Holding Down Your Technical Debt With SonarQube at I T....Patroklos Papapetrou: Holding Down Your Technical Debt With SonarQube at I T....
Patroklos Papapetrou: Holding Down Your Technical Debt With SonarQube at I T....
 
Robert Mircea & Virgil Chereches: Our Journey To Continuous Delivery at I T.A...
Robert Mircea & Virgil Chereches: Our Journey To Continuous Delivery at I T.A...Robert Mircea & Virgil Chereches: Our Journey To Continuous Delivery at I T.A...
Robert Mircea & Virgil Chereches: Our Journey To Continuous Delivery at I T.A...
 
James Lewis: Microservices - Systems That Are #neverdone at I T.A.K.E. Unconf...
James Lewis: Microservices - Systems That Are #neverdone at I T.A.K.E. Unconf...James Lewis: Microservices - Systems That Are #neverdone at I T.A.K.E. Unconf...
James Lewis: Microservices - Systems That Are #neverdone at I T.A.K.E. Unconf...
 
Flavius Ștef: Big Rewrites Without Big Risks at I T.A.K.E. Unconference
Flavius Ștef: Big Rewrites Without Big Risks at I T.A.K.E. UnconferenceFlavius Ștef: Big Rewrites Without Big Risks at I T.A.K.E. Unconference
Flavius Ștef: Big Rewrites Without Big Risks at I T.A.K.E. Unconference
 
Adi Bolboacă: Architecture For Disaster Resistant Systems at I T.A.K.E. Unco...
Adi Bolboacă: Architecture For Disaster Resistant Systems at I T.A.K.E. Unco...Adi Bolboacă: Architecture For Disaster Resistant Systems at I T.A.K.E. Unco...
Adi Bolboacă: Architecture For Disaster Resistant Systems at I T.A.K.E. Unco...
 
Alex Bolboacă: Why You Should Start Using Docker at I T.A.K.E. Unconference ...
Alex Bolboacă: Why You Should Start Using Docker at I T.A.K.E. Unconference ...Alex Bolboacă: Why You Should Start Using Docker at I T.A.K.E. Unconference ...
Alex Bolboacă: Why You Should Start Using Docker at I T.A.K.E. Unconference ...
 
Svetlana Mukhina: Metrics That Bring Value at I T.A.K.E. Unconference 2015
Svetlana Mukhina: Metrics That Bring Value at I T.A.K.E. Unconference 2015Svetlana Mukhina: Metrics That Bring Value at I T.A.K.E. Unconference 2015
Svetlana Mukhina: Metrics That Bring Value at I T.A.K.E. Unconference 2015
 
Aki Salmi: Object Oriented Views at I T.A.K.E. Unconference 2015
Aki Salmi: Object Oriented Views at I T.A.K.E. Unconference 2015Aki Salmi: Object Oriented Views at I T.A.K.E. Unconference 2015
Aki Salmi: Object Oriented Views at I T.A.K.E. Unconference 2015
 
Stefan Kanev: Clojure, ClojureScript and Why They're Awesome at I T.A.K.E. Un...
Stefan Kanev: Clojure, ClojureScript and Why They're Awesome at I T.A.K.E. Un...Stefan Kanev: Clojure, ClojureScript and Why They're Awesome at I T.A.K.E. Un...
Stefan Kanev: Clojure, ClojureScript and Why They're Awesome at I T.A.K.E. Un...
 
Igor Popov: Mutation Testing at I T.A.K.E. Unconference 2015
Igor Popov: Mutation Testing at I T.A.K.E. Unconference 2015Igor Popov: Mutation Testing at I T.A.K.E. Unconference 2015
Igor Popov: Mutation Testing at I T.A.K.E. Unconference 2015
 

Recently uploaded

Visualising and forecasting stocks using Dash
Visualising and forecasting stocks using DashVisualising and forecasting stocks using Dash
Visualising and forecasting stocks using Dashnarutouzumaki53779
 
Time Series Foundation Models - current state and future directions
Time Series Foundation Models - current state and future directionsTime Series Foundation Models - current state and future directions
Time Series Foundation Models - current state and future directionsNathaniel Shimoni
 
Passkey Providers and Enabling Portability: FIDO Paris Seminar.pptx
Passkey Providers and Enabling Portability: FIDO Paris Seminar.pptxPasskey Providers and Enabling Portability: FIDO Paris Seminar.pptx
Passkey Providers and Enabling Portability: FIDO Paris Seminar.pptxLoriGlavin3
 
Nell’iperspazio con Rocket: il Framework Web di Rust!
Nell’iperspazio con Rocket: il Framework Web di Rust!Nell’iperspazio con Rocket: il Framework Web di Rust!
Nell’iperspazio con Rocket: il Framework Web di Rust!Commit University
 
New from BookNet Canada for 2024: BNC CataList - Tech Forum 2024
New from BookNet Canada for 2024: BNC CataList - Tech Forum 2024New from BookNet Canada for 2024: BNC CataList - Tech Forum 2024
New from BookNet Canada for 2024: BNC CataList - Tech Forum 2024BookNet Canada
 
[Webinar] SpiraTest - Setting New Standards in Quality Assurance
[Webinar] SpiraTest - Setting New Standards in Quality Assurance[Webinar] SpiraTest - Setting New Standards in Quality Assurance
[Webinar] SpiraTest - Setting New Standards in Quality AssuranceInflectra
 
SIP trunking in Janus @ Kamailio World 2024
SIP trunking in Janus @ Kamailio World 2024SIP trunking in Janus @ Kamailio World 2024
SIP trunking in Janus @ Kamailio World 2024Lorenzo Miniero
 
(How to Program) Paul Deitel, Harvey Deitel-Java How to Program, Early Object...
(How to Program) Paul Deitel, Harvey Deitel-Java How to Program, Early Object...(How to Program) Paul Deitel, Harvey Deitel-Java How to Program, Early Object...
(How to Program) Paul Deitel, Harvey Deitel-Java How to Program, Early Object...AliaaTarek5
 
The Role of FIDO in a Cyber Secure Netherlands: FIDO Paris Seminar.pptx
The Role of FIDO in a Cyber Secure Netherlands: FIDO Paris Seminar.pptxThe Role of FIDO in a Cyber Secure Netherlands: FIDO Paris Seminar.pptx
The Role of FIDO in a Cyber Secure Netherlands: FIDO Paris Seminar.pptxLoriGlavin3
 
Ensuring Technical Readiness For Copilot in Microsoft 365
Ensuring Technical Readiness For Copilot in Microsoft 365Ensuring Technical Readiness For Copilot in Microsoft 365
Ensuring Technical Readiness For Copilot in Microsoft 3652toLead Limited
 
TeamStation AI System Report LATAM IT Salaries 2024
TeamStation AI System Report LATAM IT Salaries 2024TeamStation AI System Report LATAM IT Salaries 2024
TeamStation AI System Report LATAM IT Salaries 2024Lonnie McRorey
 
How AI, OpenAI, and ChatGPT impact business and software.
How AI, OpenAI, and ChatGPT impact business and software.How AI, OpenAI, and ChatGPT impact business and software.
How AI, OpenAI, and ChatGPT impact business and software.Curtis Poe
 
Enhancing User Experience - Exploring the Latest Features of Tallyman Axis Lo...
Enhancing User Experience - Exploring the Latest Features of Tallyman Axis Lo...Enhancing User Experience - Exploring the Latest Features of Tallyman Axis Lo...
Enhancing User Experience - Exploring the Latest Features of Tallyman Axis Lo...Scott Andery
 
What is DBT - The Ultimate Data Build Tool.pdf
What is DBT - The Ultimate Data Build Tool.pdfWhat is DBT - The Ultimate Data Build Tool.pdf
What is DBT - The Ultimate Data Build Tool.pdfMounikaPolabathina
 
Modern Roaming for Notes and Nomad – Cheaper Faster Better Stronger
Modern Roaming for Notes and Nomad – Cheaper Faster Better StrongerModern Roaming for Notes and Nomad – Cheaper Faster Better Stronger
Modern Roaming for Notes and Nomad – Cheaper Faster Better Strongerpanagenda
 
Merck Moving Beyond Passwords: FIDO Paris Seminar.pptx
Merck Moving Beyond Passwords: FIDO Paris Seminar.pptxMerck Moving Beyond Passwords: FIDO Paris Seminar.pptx
Merck Moving Beyond Passwords: FIDO Paris Seminar.pptxLoriGlavin3
 
Transcript: New from BookNet Canada for 2024: BNC CataList - Tech Forum 2024
Transcript: New from BookNet Canada for 2024: BNC CataList - Tech Forum 2024Transcript: New from BookNet Canada for 2024: BNC CataList - Tech Forum 2024
Transcript: New from BookNet Canada for 2024: BNC CataList - Tech Forum 2024BookNet Canada
 
SALESFORCE EDUCATION CLOUD | FEXLE SERVICES
SALESFORCE EDUCATION CLOUD | FEXLE SERVICESSALESFORCE EDUCATION CLOUD | FEXLE SERVICES
SALESFORCE EDUCATION CLOUD | FEXLE SERVICESmohitsingh558521
 
Exploring ChatGPT Prompt Hacks To Maximally Optimise Your Queries
Exploring ChatGPT Prompt Hacks To Maximally Optimise Your QueriesExploring ChatGPT Prompt Hacks To Maximally Optimise Your Queries
Exploring ChatGPT Prompt Hacks To Maximally Optimise Your QueriesSanjay Willie
 
DevoxxFR 2024 Reproducible Builds with Apache Maven
DevoxxFR 2024 Reproducible Builds with Apache MavenDevoxxFR 2024 Reproducible Builds with Apache Maven
DevoxxFR 2024 Reproducible Builds with Apache MavenHervé Boutemy
 

Recently uploaded (20)

Visualising and forecasting stocks using Dash
Visualising and forecasting stocks using DashVisualising and forecasting stocks using Dash
Visualising and forecasting stocks using Dash
 
Time Series Foundation Models - current state and future directions
Time Series Foundation Models - current state and future directionsTime Series Foundation Models - current state and future directions
Time Series Foundation Models - current state and future directions
 
Passkey Providers and Enabling Portability: FIDO Paris Seminar.pptx
Passkey Providers and Enabling Portability: FIDO Paris Seminar.pptxPasskey Providers and Enabling Portability: FIDO Paris Seminar.pptx
Passkey Providers and Enabling Portability: FIDO Paris Seminar.pptx
 
Nell’iperspazio con Rocket: il Framework Web di Rust!
Nell’iperspazio con Rocket: il Framework Web di Rust!Nell’iperspazio con Rocket: il Framework Web di Rust!
Nell’iperspazio con Rocket: il Framework Web di Rust!
 
New from BookNet Canada for 2024: BNC CataList - Tech Forum 2024
New from BookNet Canada for 2024: BNC CataList - Tech Forum 2024New from BookNet Canada for 2024: BNC CataList - Tech Forum 2024
New from BookNet Canada for 2024: BNC CataList - Tech Forum 2024
 
[Webinar] SpiraTest - Setting New Standards in Quality Assurance
[Webinar] SpiraTest - Setting New Standards in Quality Assurance[Webinar] SpiraTest - Setting New Standards in Quality Assurance
[Webinar] SpiraTest - Setting New Standards in Quality Assurance
 
SIP trunking in Janus @ Kamailio World 2024
SIP trunking in Janus @ Kamailio World 2024SIP trunking in Janus @ Kamailio World 2024
SIP trunking in Janus @ Kamailio World 2024
 
(How to Program) Paul Deitel, Harvey Deitel-Java How to Program, Early Object...
(How to Program) Paul Deitel, Harvey Deitel-Java How to Program, Early Object...(How to Program) Paul Deitel, Harvey Deitel-Java How to Program, Early Object...
(How to Program) Paul Deitel, Harvey Deitel-Java How to Program, Early Object...
 
The Role of FIDO in a Cyber Secure Netherlands: FIDO Paris Seminar.pptx
The Role of FIDO in a Cyber Secure Netherlands: FIDO Paris Seminar.pptxThe Role of FIDO in a Cyber Secure Netherlands: FIDO Paris Seminar.pptx
The Role of FIDO in a Cyber Secure Netherlands: FIDO Paris Seminar.pptx
 
Ensuring Technical Readiness For Copilot in Microsoft 365
Ensuring Technical Readiness For Copilot in Microsoft 365Ensuring Technical Readiness For Copilot in Microsoft 365
Ensuring Technical Readiness For Copilot in Microsoft 365
 
TeamStation AI System Report LATAM IT Salaries 2024
TeamStation AI System Report LATAM IT Salaries 2024TeamStation AI System Report LATAM IT Salaries 2024
TeamStation AI System Report LATAM IT Salaries 2024
 
How AI, OpenAI, and ChatGPT impact business and software.
How AI, OpenAI, and ChatGPT impact business and software.How AI, OpenAI, and ChatGPT impact business and software.
How AI, OpenAI, and ChatGPT impact business and software.
 
Enhancing User Experience - Exploring the Latest Features of Tallyman Axis Lo...
Enhancing User Experience - Exploring the Latest Features of Tallyman Axis Lo...Enhancing User Experience - Exploring the Latest Features of Tallyman Axis Lo...
Enhancing User Experience - Exploring the Latest Features of Tallyman Axis Lo...
 
What is DBT - The Ultimate Data Build Tool.pdf
What is DBT - The Ultimate Data Build Tool.pdfWhat is DBT - The Ultimate Data Build Tool.pdf
What is DBT - The Ultimate Data Build Tool.pdf
 
Modern Roaming for Notes and Nomad – Cheaper Faster Better Stronger
Modern Roaming for Notes and Nomad – Cheaper Faster Better StrongerModern Roaming for Notes and Nomad – Cheaper Faster Better Stronger
Modern Roaming for Notes and Nomad – Cheaper Faster Better Stronger
 
Merck Moving Beyond Passwords: FIDO Paris Seminar.pptx
Merck Moving Beyond Passwords: FIDO Paris Seminar.pptxMerck Moving Beyond Passwords: FIDO Paris Seminar.pptx
Merck Moving Beyond Passwords: FIDO Paris Seminar.pptx
 
Transcript: New from BookNet Canada for 2024: BNC CataList - Tech Forum 2024
Transcript: New from BookNet Canada for 2024: BNC CataList - Tech Forum 2024Transcript: New from BookNet Canada for 2024: BNC CataList - Tech Forum 2024
Transcript: New from BookNet Canada for 2024: BNC CataList - Tech Forum 2024
 
SALESFORCE EDUCATION CLOUD | FEXLE SERVICES
SALESFORCE EDUCATION CLOUD | FEXLE SERVICESSALESFORCE EDUCATION CLOUD | FEXLE SERVICES
SALESFORCE EDUCATION CLOUD | FEXLE SERVICES
 
Exploring ChatGPT Prompt Hacks To Maximally Optimise Your Queries
Exploring ChatGPT Prompt Hacks To Maximally Optimise Your QueriesExploring ChatGPT Prompt Hacks To Maximally Optimise Your Queries
Exploring ChatGPT Prompt Hacks To Maximally Optimise Your Queries
 
DevoxxFR 2024 Reproducible Builds with Apache Maven
DevoxxFR 2024 Reproducible Builds with Apache MavenDevoxxFR 2024 Reproducible Builds with Apache Maven
DevoxxFR 2024 Reproducible Builds with Apache Maven
 

Alex Bolboacă: Usable Software Design at I T.A.K.E. Unconference 2015

  • 1. Usable Software Design A Talk by Alex Bolboaca http://www.nasa.gov/sites/default/files/thumbnails/image/iss043e124426.jpg
  • 3.
  • 4.
  • 5.
  • 6. Naomi Weast Actress, not a programmer https://plus.google.com/110657773112027365790/posts
  • 7.
  • 8. It reminds me of something else
  • 9. Jacques Carelman Artist, creator of “The Catalogue of Impossible Objects” in the 60s http://www.patakosmos.com/wp-content/uploads/2013/09/RDA00147250.jpg
  • 10. Coffee pot for masochists Catalogue of Impossible Objects by Jacques Carelman http://impossibleobjects.com/catalogue/coffeepot-for-masochists.html
  • 11. Absorbent Bottle Catalogue of Impossible Objects by Jacques Carelman http://impossibleobjects.com/catalogue/absorbent-bottle.html
  • 12. Siamese Hammers Catalogue of Impossible Objects by Jacques Carelman http://impossibleobjects.com/catalogue/siamese-hammers.html
  • 13. It reminds me of something I read in a book ...
  • 14. Donald A. Norman Author of “The Design of Everyday Things” http://www.jnd.org/NNg-Photographs/Photo1.jpg “It is the duty of machines and those who design them to understand people. It is not our duty to understand the arbitrary, meaningless dictates of machines.”
  • 15. User Centric Design Process by UXPA Revolution started by Donald A. Norman's book http://uxmastery.com/what-does-a-user-centred-design-process-look-like/
  • 16. All designs have an user. Who is the user of software design? Can't be the end user. Only one answer: the developer is the user of software design. So, then, developer-centric software design is a thing? How about “Usable Software Design”?
  • 17. You Are The User: Changing Code ● Figure out what you need to change ● Navigate there ● Read the code, tests, documentation, comments ● Write/change code, write/change tests ● Refactor ● Build ● Validate ● Integrate
  • 18. Figure Out What To Change ● How easy can you reason about the runtime behavior based on the static structure of the code?
  • 21. Is Your Design Easy to Navigate? ● What module / namespace to look in? – See previous examples ● How is that thing named? – Should be Consistent, Memorable, Precise ● How deep is the inheritance tree?
  • 24. This is just the beginning
  • 25. What is Usable Software Design?
  • 26. What is Usable Software Design? Usable Software Design is any code structure that exhibits design qualities similar to usability
  • 27. 5 Design Qualities of Usability 1. Learnability 2. Efficiency 3. Memorability 4. Errors 5. Satisfaction http://www.nngroup.com/articles/usability-101-introduction-to- usability/ How easy it is to accomplish basic tasks the first time you're using the design? How quickly can you perform a task once you've learned the design? When you go back to the design after a period of not using it, how easy is to become efficient again? How many errors do you make, how severe are they and how can you recover from them? How pleasant it is to use the design?
  • 28. How to Improve The Usability of Software Design?
  • 29. Developer Persona For Your Team ● Kernel Developer ● Java Enterprise Developer ● Rails Developer ● C/C++ Embedded Developer ● Android Developer ● Front-end Javascript + html + CSS developer ● Etc. Each persona has different needs. Usability depends on the user!
  • 30. Example of Team Agreement Usable Software Design means to us that: 1. It is written for developers to read 2. It is easy to find where to modify the code 3. Any modification has a minimal ripple-effect 4. It is easy AND fast to validate that we did the right thing 5. We don’t have to do similar modifications in several places Usable Software Design – A Federating Concep t by Johan Martinsson
  • 31. Next Step: Practices “It is written for developers to read” => coding guidelines, clean code etc. “It is easy to find where to modify the code” => navigability, consistency etc. “Any modification has a minimal ripple effect” => follow Open Closed Principle, Single Responsibility Principle etc.
  • 32. Specific practices for Usable Software Design? (Incomplete list)
  • 33. 1. Learnability How easy is it for users to accomplish basic tasks the first time they encounter the design?
  • 34. Hints: Design For Learnability Code structure that shows what the application does Consistency Minimal Surprise Use Clearly Defined Modules With Clear APIs Readability / Clean Code Navigability Add Usage examples – tests / comments etc
  • 35. Test Learnability Measure how long it takes for developers outside your team to understand the purpose of a class with as little help as possible.
  • 36. 2. Efficiency Once users have learned the design, how quickly can they perform tasks?
  • 37. Hints: Design For Efficiency Use code constructs the whole team understands Consistency Fast Validation
  • 38. Test Efficiency Retro question: “what slowed you down in the past two weeks?” Measure how long it takes for developers to finish typical tasks (not simple, but typical)
  • 39. 3. Memorability When you go back to the design after a period of not using it, how easy is to become efficient again?
  • 40. Memorability ≈ Efficiency + Learnability + The style is internalized
  • 41. 4. Errors How many errors do you make? How severe are these errors? How easily can they recover from the errors?
  • 42. Hints: Design For Mistake Proofing It's the system's fault Write automated tests Eliminate exceptions Pass mandatory arguments to constructor (more difficult when using Dependency Injection libraries) Avoid Primitive Obsession Principle of Minimum Surprise
  • 44. Test Mistake-Proofing How many bugs do we have? What is the main cause of the bugs? (remember, it's typically in the design) How can we change the design to avoid it?
  • 45. 4. Satisfaction How pleasant is it to use the design?
  • 46. Hints: Design For Satisfaction Strictly personal, but relevant
  • 47. Test Satisfaction What parts of the system are unpleasant to use? How can we change them to be more pleasant?
  • 48. What To Tell Managers Usable Software Design has the potential to bring four economical benefits: ● Faster integration of new developers in the team (learnability) ● Faster time to implement typical (not simple) tasks (efficiency) ● Making less mistakes (mistake-proofing) ● Feeling more motivated (satisfaction)
  • 50. Recap ● The developer is the user of software design ● Usable software design means code structure that exhibits the qualities of usability: Learnability, Efficiency, Memorability, Error Treatment and Satisfaction ● Define the personas of your team ● Create a team agreement ● Start applying practices that help the agreement ● This is just the beginning