Prototyping is used to find issues early and cheaply by testing ideas with target users. The goals of prototyping include exploring requirements, market analysis, choosing alternatives, and usability testing. To prototype, a basic functional version is built, tested for errors, corrected, and repeated until clean. Prototyping involves establishing objectives, defining functionality, developing a prototype, evaluating it, and evolving the prototype based on findings. Prototypes can take many forms from mockups to functional interfaces.

1. Prototype

2. Why prototype ?
• Prototyping is the way to find what doesn’t work early and cheap,
and spend your time and money on solutions that do work

3. MEASURE
IDEAS
BUILD
CODE
LEARN
DATA
PROTOTYPE

4. Goals of prototyping
• Exploring requirements
• Market analysis, participatory design
• Choosing among alternatives
• Risky or critical feature, go/no-go decisions
• Empirical usability testing
• As early as possible, try out ideas with target users

5. How to prototype ?
• Build – A prototype of the basic functionality, especially the
interface
• Test – The prototype, which will uncover design errors
• Correct - The errors
• Repeat – Until you have a clean design

6. Prototyping Process
Establish
prototype
objectives
Define
prototype
functionality
Develop
prototype
Evaluate
prototype
Prototyping plan Evolution report
Executable
prototype
Outline definition

7. Prototyping for usability
• Usability = ease of use of an application
• Design typical user task scenarios
• identify tasks based on the scenarios
• Use “real user” to test
• Watch user performing task

8. Cost of prototyping
• Cheaper then not doing it
• Usability work should amount for 2-5% of the project budget
• Testing easier, low man power

9. Benefits of prototyping
• Can be used to test every detail of the line product before the
project/product is build
• Results in higher user satisfaction
• Users are better at evaluating an existing system
• It brings the users into the process early

10. Prototype representation
• Mockup / wireframing
• Storyboard
• Sketches
• Scenarios
• Screenshots
• Functional interface

11. Evolutionary prototyping
Develop
abstract
specification
Build
prototype
system
Use
prototype
system
Deliver
system
System
adequa
te?
No
Yes

12. Two sample project/product prototyping and
wireframing
1. Bangla corpus collection (smartphone)
2. Annotator (web-desktop)

13. 1.Bangla corpus collection prototyping (smartphone)

15. 2.Annotator (web-desktop)