Explains the causes of the Ariane 5 launcher failure in 1996. Due to a failure in the software controlling the inertial navigation system
Video: http://www.youtube.com/watch?v=W3YJeoYgozw
Let's explore what is agile testing, how agile testing is different than traditional testing. What practices team has to adopt to have parallel testing and how to create your own test automation framework. Test automation frameworks using cucumber, selenium, junit, nunit, rspec, coded UI etc.
Five Common Mistakes made when Conducting a Software FMECAAnn Marie Neufelder
The software FMECA is a powerful tool for identifying software failure modes but there are 5 common mistakes that can derail the effectiveness of the analysis.
Software FMEA and Software FTA – An Effective Tool for Embedded Software Qual...Mahindra Satyam
One of the most important activities in the software development process is the software quality assurance. The software quality assurance consists of activities such as design walk throughs, testing and inspections. These activities are carried out in the following phases: functional requirement specifications, software design,detailed design and coding.This paper discusses the details of software FMEA and software FTA which are
effective in the software quality assurance phase with an example.
An Introduction to Software Failure Modes Effects Analysis (SFMEA)Ann Marie Neufelder
Software Failure Modes Effects Analysis (SFMEA) is an effective tool for identifying what software applications should NOT do. Software testing is often focused on nominal conditions and often doesn't discover serious defects.
Let's explore what is agile testing, how agile testing is different than traditional testing. What practices team has to adopt to have parallel testing and how to create your own test automation framework. Test automation frameworks using cucumber, selenium, junit, nunit, rspec, coded UI etc.
Five Common Mistakes made when Conducting a Software FMECAAnn Marie Neufelder
The software FMECA is a powerful tool for identifying software failure modes but there are 5 common mistakes that can derail the effectiveness of the analysis.
Software FMEA and Software FTA – An Effective Tool for Embedded Software Qual...Mahindra Satyam
One of the most important activities in the software development process is the software quality assurance. The software quality assurance consists of activities such as design walk throughs, testing and inspections. These activities are carried out in the following phases: functional requirement specifications, software design,detailed design and coding.This paper discusses the details of software FMEA and software FTA which are
effective in the software quality assurance phase with an example.
An Introduction to Software Failure Modes Effects Analysis (SFMEA)Ann Marie Neufelder
Software Failure Modes Effects Analysis (SFMEA) is an effective tool for identifying what software applications should NOT do. Software testing is often focused on nominal conditions and often doesn't discover serious defects.
Unit 3 Control Flow Testing contains Concept of CFT, Generate Test Input Data, Activities of Generating Test Input Data, Control Flow Graph, Path Selection Criteria, Techniques for Path Selection statement wise, branch wise, predicate wise etc. and Generating Test Input.
The software Common Defect Enumeration is a means to categorize the root causes of software defects that originate in the specifications, design, interfaces. Early defect enumerations focused on coding related issues.
We have analyzed almost 1 million software failures and less than half originate in the coding activity. Mitre's Common Weakness Enumeration provides for standardization and organization of vulnerabilities as well as a means to update that enumeration with new vulnerabilities. This CDE provides for the same goals except that it focuses on software defects.
The enumeration is categorized by the architectural level, type of failure and where it originates. Some defects apply to the entire software system. Peak loading related defects for example tend to apply to the whole application. Some defects apply at a capability or feature level. Sometimes the features may be inconsistent with each other or executed out of order. Some defects originate in a single specification. Some defects originate in the interfaces between the software/hardware.
The types of failure modes include faulty functionality, faulty error handlings, faulty state management, faulty sequencing, faulty timing, faulty data definition, faulty processing, faulty machine learning, faulty logic and faulty I/O.
The origination of the defect is either in the specifications (the whats), the design (the hows) or the coding. The defect is attributed to specification if the whats aren't fully identified, are ambiguous, conflicting, over engineered or underengineered. The defect is attributed to design if the software engineer knows what to develop but didn't consider the state design, data design, logic design, timing design, fault management design considerations prior to coding. A defect originates in coding if the software engineer knows what to code and how to code it but the code doesn't work correctly.
The CDE has descriptions of each defect, examples, how to mitigate them. It can be used during a requirements or design review and it can be used for software failure modes effects analysis and software fault tree analysis.
- Understand the principles behind the agile approach to software development
- Differentiate between the testing role in agile projects compared with the role of testers in non-agile projects
- Positively contribute as an agile team member focused on testing
- Appreciate the challenges and difficulties associated with the non-testing activities performed in an agile team
- Demonstrate a range of soft skills required by agile team members
MindScripts Technologies is the authorized Softwrae Testing Training institutes in Pune, providing a complete softwrae testing certification course with ISTQB certification. It provides a IBM Certified courses.
Software testing is an investigation conducted to provide stakeholders with information about the quality of the product or service under test. I hope this ppt will help u to learn about software testing.
You can predict software reliability before the code is even finished. Predictions support planning, sensitivity analysis and also help to avoid distressed software projects and defect pile up.
Unit 3 Control Flow Testing contains Concept of CFT, Generate Test Input Data, Activities of Generating Test Input Data, Control Flow Graph, Path Selection Criteria, Techniques for Path Selection statement wise, branch wise, predicate wise etc. and Generating Test Input.
The software Common Defect Enumeration is a means to categorize the root causes of software defects that originate in the specifications, design, interfaces. Early defect enumerations focused on coding related issues.
We have analyzed almost 1 million software failures and less than half originate in the coding activity. Mitre's Common Weakness Enumeration provides for standardization and organization of vulnerabilities as well as a means to update that enumeration with new vulnerabilities. This CDE provides for the same goals except that it focuses on software defects.
The enumeration is categorized by the architectural level, type of failure and where it originates. Some defects apply to the entire software system. Peak loading related defects for example tend to apply to the whole application. Some defects apply at a capability or feature level. Sometimes the features may be inconsistent with each other or executed out of order. Some defects originate in a single specification. Some defects originate in the interfaces between the software/hardware.
The types of failure modes include faulty functionality, faulty error handlings, faulty state management, faulty sequencing, faulty timing, faulty data definition, faulty processing, faulty machine learning, faulty logic and faulty I/O.
The origination of the defect is either in the specifications (the whats), the design (the hows) or the coding. The defect is attributed to specification if the whats aren't fully identified, are ambiguous, conflicting, over engineered or underengineered. The defect is attributed to design if the software engineer knows what to develop but didn't consider the state design, data design, logic design, timing design, fault management design considerations prior to coding. A defect originates in coding if the software engineer knows what to code and how to code it but the code doesn't work correctly.
The CDE has descriptions of each defect, examples, how to mitigate them. It can be used during a requirements or design review and it can be used for software failure modes effects analysis and software fault tree analysis.
- Understand the principles behind the agile approach to software development
- Differentiate between the testing role in agile projects compared with the role of testers in non-agile projects
- Positively contribute as an agile team member focused on testing
- Appreciate the challenges and difficulties associated with the non-testing activities performed in an agile team
- Demonstrate a range of soft skills required by agile team members
MindScripts Technologies is the authorized Softwrae Testing Training institutes in Pune, providing a complete softwrae testing certification course with ISTQB certification. It provides a IBM Certified courses.
Software testing is an investigation conducted to provide stakeholders with information about the quality of the product or service under test. I hope this ppt will help u to learn about software testing.
You can predict software reliability before the code is even finished. Predictions support planning, sensitivity analysis and also help to avoid distressed software projects and defect pile up.
Introduces real-time software systems and discusses differences between these and other types of system. Accompanies video at:
https://youtu.be/_U6Le3_eL2I
Introduces the idea of a software process and describes generic plan-based and agile processes.
Accompanies video:
https://www.youtube.com/watch?v=q8X2Rk5sRFI
Describes the basic activities of software engineering - specification, design and implementation, validation and evolution.
Accompanies video:
https://www.youtube.com/watch?v=Z2no7DxDWRI
Explains why the characteristics of large anc complex software systems mean that agile methods cannot be used without change in their development
Accompanies YouTube video
https://www.youtube.com/watch?v=L1JcQDHJzHA
Discusses some of the issues involved in scaling agile methods for large systems engineering.
Accompanies YouTube video atL
https://www.youtube.com/watch?v=GuK46hw3CyI
Ariane 5 is a European heavy-lift launch vehicle that is part of the Ariane rocket family, an expendable launch system designed by the French government space agency Centre national d'études spatiales (CNES).
Western Iowa Tech Community College Fluke Connect Student Contest Presentationflukecontests
Troubleshooting intermittent electrical issues in wind turbines. Project entry for the Fluke Connect Student Contest by Western Iowa Tech Community College. For more info, or to vote, go to https://www.facebook.com/fluke.corporation/
To discuss the distinctions between
validation testing and defect testing
● To describe the principles of system and
component testing
● To describe strategies for generating system
test cases
● To understand the essential characteristics
of tool used for test automation
Ariane 5 is a European heavy-lift launch vehicle that is part of the Ariane rocket family, an expendable launch system designed by the French government space agency Centre national d'études spatiales (CNES).
Risk management and business protection with Coding Standardization & Static ...Itris Automation Square
The following topic was presented at the CSIA 2013 Executive Conference: "Risk management and business protection with Coding Standardization & Static Analyzer".
http://csiaexecutiveconference.org/
http://www.controlsys.org/
Test Automation Improvement by Machine Learning Jasst'21 TokyoSadaaki Emura
We have challenging issue in test automation operation.
Test automation fail by bug and not bug reason.
I think one of the main reason is temporary accident.
When test automation fail by this temporary accident, test will be success by running test again usually.
This re-run operation is boaring task and big task for test automation operation
To eliminate this kind issue and improve operation, we built system categorize issue by machine learning, re-run test only when fail reason is temporary accident.
In this session , I show you these below
- What's test automation issue in daily operation
- How to resolve this issue. store big data, learning, system architecture etc.
- Actual result for improvement
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Elevating Tactical DDD Patterns Through Object CalisthenicsDorra BARTAGUIZ
After immersing yourself in the blue book and its red counterpart, attending DDD-focused conferences, and applying tactical patterns, you're left with a crucial question: How do I ensure my design is effective? Tactical patterns within Domain-Driven Design (DDD) serve as guiding principles for creating clear and manageable domain models. However, achieving success with these patterns requires additional guidance. Interestingly, we've observed that a set of constraints initially designed for training purposes remarkably aligns with effective pattern implementation, offering a more ‘mechanical’ approach. Let's explore together how Object Calisthenics can elevate the design of your tactical DDD patterns, offering concrete help for those venturing into DDD for the first time!
Generating a custom Ruby SDK for your web service or Rails API using Smithyg2nightmarescribd
Have you ever wanted a Ruby client API to communicate with your web service? Smithy is a protocol-agnostic language for defining services and SDKs. Smithy Ruby is an implementation of Smithy that generates a Ruby SDK using a Smithy model. In this talk, we will explore Smithy and Smithy Ruby to learn how to generate custom feature-rich SDKs that can communicate with any web service, such as a Rails JSON API.
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
Key Trends Shaping the Future of Infrastructure.pdfCheryl Hung
Keynote at DIGIT West Expo, Glasgow on 29 May 2024.
Cheryl Hung, ochery.com
Sr Director, Infrastructure Ecosystem, Arm.
The key trends across hardware, cloud and open-source; exploring how these areas are likely to mature and develop over the short and long-term, and then considering how organisations can position themselves to adapt and thrive.
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
Encryption in Microsoft 365 - ExpertsLive Netherlands 2024Albert Hoitingh
In this session I delve into the encryption technology used in Microsoft 365 and Microsoft Purview. Including the concepts of Customer Key and Double Key Encryption.
Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
In today's fast-changing business world, Companies that adapt and embrace new ideas often need help to keep up with the competition. However, fostering a culture of innovation takes much work. It takes vision, leadership and willingness to take risks in the right proportion. Sachin Dev Duggal, co-founder of Builder.ai, has perfected the art of this balance, creating a company culture where creativity and growth are nurtured at each stage.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
JMeter webinar - integration with InfluxDB and Grafana
Ariane 5 launcher failure
1. The Ariane 5 Launcher Failure
Ian Sommerville
Ariane launcher failure, Case study, 2013
Slide 1
2. June 4th 1996
Total failure of the Ariane 5
launcher on its maiden flight
Ariane launcher failure, Case study, 2013
Slide 2
3. Ariane 5
• A European rocket designed to
launch commercial payloads
(e.g.communications satellites, etc.)
into Earth orbit
• Successor to the successful Ariane
4 launchers
Ariane launcher failure, Case study, 2013
Slide 3
5. • Ariane 5 can carry a heavier payload
than Ariane 4
• Now the standard launch vehicle for the
European Space Agency
Ariane launcher failure, Case study, 2013
Slide 5
7. Launcher failure
• First test launch of Ariane 5 in June
1996
• Appoximately 37 seconds after a
successful lift-off, the Ariane 5 launcher
lost control
Ariane launcher failure, Case study, 2013
Slide 7
9. • Incorrect control signals were sent to the
engines and these swivelled so that
unsustainable stresses were imposed on
the rocket
• The vehicle started to break up because
of the stresses imposed and selfdestructed
Ariane launcher failure, Case study, 2013
Slide 9
10. The problem
• The attitude and trajectory of the
rocket are measured by a
computer-based inertial reference
system.
• The IRS transmits commands to the
engines to maintain attitude (the
angle to the vertical) and direction
Ariane launcher failure, Case study, 2013
Slide 10
11. • The system failure was a direct result of
a software failure.
• However, it was symptomatic of a more
general systems validation failure
Ariane launcher failure, Case study, 2013
Slide 11
13. • The IRS had both a primary and a
backup computer
• The backup computer was included to
cope with hardware failure but both the
primary and the backup system ran the
same software.
Ariane launcher failure, Case study, 2013
Slide 13
14. • The IRS software in both the primary and the backup
computer shut itself down 37 seconds after take-off
• Diagnostic data about the shutdown was sent to the
engine control system
• This system did not expect such data and interpreted
these as real data
•
The values were such that the system swivelled the
rocket engines to an extreme position
Ariane launcher failure, Case study, 2013
Slide 14
15. Software failure
• Software failure occurred when an
attempt to convert a 64-bit floating point
number representing the horizontal
velocity to a signed 16-bit integer caused
the number to overflow (become too
big).
Ariane launcher failure, Case study, 2013
Slide 15
17. • There was no exception handler associated with the
conversion so the system exception management
facilities were invoked. These shut down the software
controlling the IRS.
• Redundant but not diverse software
• The backup software was a copy and behaved in
exactly the same way i.e. the number overflowed and
the system was shut down
Ariane launcher failure, Case study, 2013
Slide 17
18. Avoidable failure?
• The software that failed was reused from
the Ariane 4 launch vehicle. The
computation that resulted in overflow
was not used by Ariane 5.
• The calculations had been transferred to
a ground-based system in Ariane 5
Ariane launcher failure, Case study, 2013
Slide 18
19. Implementation decisions
• Decisions were made
– Not to remove the facility as this could introduce
new faults
– Not to test for overflow exceptions because the
processor was heavily loaded.
– For dependability reasons, it was thought desirable
to have some spare processor capacity
Ariane launcher failure, Case study, 2013
Slide 19
20. Why not Ariane 4?
• The physical characteristics of Ariane 4 (A smaller
vehicle) are such that it has a lower initial acceleration
and build up of horizontal velocity than Ariane 5
• The value of the variable on Ariane 4 could never
reach a level that caused overflow during the launch
period.
• This calculation had been carried out during the
development of Ariane 4 and it was therefore decided
that no overflow check was required
Ariane launcher failure, Case study, 2013
Slide 20
21. Validation failure
• As the facility that failed was not required
for Ariane 5, there was no requirement
associated with it.
• As there was no associated requirement,
there were no tests of that part of the
software and hence no possibility of
discovering the problem.
Ariane launcher failure, Case study, 2013
Slide 21
22. Simulator-based testing
• During system testing, simulators of the
inertial reference system computers
were used.
• These did not generate the error as
there was no requirement for the unused
code to be included in the simulator
Ariane launcher failure, Case study, 2013
Slide 22
23. Review failure
• Review failures?
• The inertial reference system software was not
reviewed because it had been used in a previous
version
• The review failed to expose the problem or that the
test coverage would not reveal the problem
• The review failed to appreciate the consequences of
system shutdown during a launch
Ariane launcher failure, Case study, 2013
Slide 23
25. Lessons learned
• Don’t run software in critical systems unless it is
actually needed
• As well as testing for what the system should do, you
may also have to test for what the system should not
do
• Do not have a default exception handling response
which is system shut-down in systems that have no
fail-safe state
Ariane launcher failure, Case study, 2013
Slide 25
26. Lessons learned
• In critical computations, always return best effort
values even if the absolutely correct values cannot be
computed
• Wherever possible, use real equipment and not
simulations
• Improve the review process to include external
participants and review all assumptions made in the
code
Ariane launcher failure, Case study, 2013
Slide 26