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Embedded Systems Engineering
Agile for Aerospace
Andrew Buter, Curt Stienstra, Steven H. VanderLeest
GLSEC 2008
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Embedded Systems Engineering
(c) 2008, DornerWorks, Ltd. 2
Outline
I. Present State of SW Dev in AerospaceA. DO-178 and the waterfall approach
B. Who is doing Agile currently?
II. Introducing Agile to AerospaceA. DO-178 on Agile practices
B. Customizing Agile for Aerospace1. What is Agile?
2. Impacts on Software Development for Aerospace
III. Q&A
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Embedded Systems Engineering
(c) 2008, DornerWorks, Ltd. 3
Outline
I. Present State of SW Dev in AerospaceA. DO-178 and the waterfall approach
B. Who is doing Agile currently?
II. Introducing Agile to AerospaceA. DO-178 on Agile practices
B. Customizing Agile for Aerospace1. What is Agile?
2. Impacts on Software Development for Aerospace
III. Q&A
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Embedded Systems Engineering
DO-178 Waterfall Approach
• Safety-critical software:
– Independence
– Traceability
– Verification/validation
• Waterfall organization of the DO-178
standard
• Problems with Waterfall
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Embedded Systems Engineering
Waterfall Defined
1. Define up front, in detail, the requirements
2. Define the “design” (text and diagrammatic descriptions of the software and hardware elements)
3. Implement the system (programming, etc.)
4. Integrate and test the components
From Larman, Agile & Iterative Development, Boston: Addison-Wesley, 2004.
(c) 2008, DornerWorks, Ltd. 5
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Embedded Systems Engineering
Problems with Waterfall
• Works for projects with little change, little novelty, and
low complexity
• Pushes high-risk and difficult elements to end of the
project
• Aggravates complexity overload
• Inability to deal with changing requirements
• Late integration
• Unreliable up-front schedules and estimates
From Larman, Agile & Iterative Development, Boston: Addison-Wesley, 2004.
(c) 2008, DornerWorks, Ltd. 6
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Embedded Systems Engineering
Problems with Waterfall
• MacCormack 2001 study of projects
– Evolutionary appproach yielded higher quality results faster
– Waterfall approaches uniformly performed poorly
• MacCormack 2003 study
– Weak relationship between detailed upfront design specifications
and low defect rate
– Earlier release with less functionality (compared to waiting for more
functionality) resulted in a lower defect rate and higher productivity
– Daily builds with integration and regression testing produced lower
defect rate and higher productivity
• Harrison 1996 study at Bell Labs identified iterative development as one of the consistent patterns in highly successful projects
From Larman, Agile & Iterative Development, Boston: Addison-Wesley, 2004.
(c) 2008, DornerWorks, Ltd. 7
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Embedded Systems Engineering
Problems with Waterfall
• Thomas 2001 study of over 1,000 IT projects in UK found single
largest factor in failed projects was scope management related to attempting waterfall practices
• Brooks 1987 committee concluded about DOD-STD-2167: “In the decade since the waterfall model was developed, our discipline as come to
recognize that setting the requirements is the most difficult and crucial part of the
software building process, and one that requires iteration between the designers
and users. In best modern practice, the early specification is embodied in a
prototype, which the intended users can themselves drive in order to see the
consequences of their imaginings. Then, as the design effort begins to yield data
on the cost and schedule consequences of particular specifications, the designers
and the users revise the specifications.”• DOD replaced DOD-STD-2167 (waterfall) with MIL-STD-498
(iterative)
• Jones 1995 study of 6,700 projects found 4 out of 5 key factors contributing to failures were associated with waterfall models
From Larman, Agile & Iterative Development, Boston: Addison-Wesley, 2004.
(c) 2008, DornerWorks, Ltd. 8
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Embedded Systems Engineering
Benefits of Agile
• Development costs reduced by up to 70%
• Quality more than 3 times better than
industry average
• Customer satisfaction 4.9 on a 5 point
scale
• 70% developer satisfaction with process
From ITEA, Project AGILE, http://www.agile-itea.org, 2006.
99(c) 2008, DornerWorks, Ltd.
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Embedded Systems Engineering
(c) 2008, DornerWorks, Ltd. 10
Outline
I. Present State of SW Dev in AerospaceA. DO-178 and the waterfall approach
B. Who is doing Agile currently?
II. Introducing Agile to AerospaceA. DO-178 on Agile practices
B. Customizing Agile for Aerospace1. What is Agile?
2. Impacts on Software Development for Aerospace
III. Q&A
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Embedded Systems Engineering
Who is doing Aerospace Agile?
• Master's thesis by Ron Chisholm at Royal Military College of Canada: "AGILE SOFTWARE DEVELOPMENT METHODS AND DO-178 CERTIFICATION“
• Pilot program at Barco (Belgian avionics equipment supplier), reported in Wils, Van Baelen, Holvoet, and DeVlaminck, "Agility in the Avionics Software World“
• Mayford Technologies reports that Space shuttle primary avionics
software developed using Agile-like processes [http://www.mayford.ca/download/TransitioningToAgile.pdf]
• Foliage: http://www.foliage.com/what-we-do/software-development.php uses Agile for development of software under FAA DO-178 and also FDA requirements
(c) 2008, DornerWorks, Ltd. 11
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Embedded Systems Engineering
Who is doing Aerospace Agile?
• “Use of Agile Techniques in the Development of a Safety-Critical
Rail Application”, Dave Nicoll, Project & Programme Manager, Silver Software, Agile Business Conference 2008, September 23-24, London.
• Lean Software Strategies: Proven Techniques for Managers and Developers by Peter Middleton and Jim Sutton [small mention of Agile techniques for Avionics]
• “Incorporation of Spiral and Agile Development into an Existing CMM Level 3 Process,” Peter Hoffman and Carl Scott, Proceedings of the 49th International Instrumentation Symposium, May 4-8 2003, Orlando, FL, p 105-117.
(c) 2008, DornerWorks, Ltd. 12
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Embedded Systems Engineering
(c) 2008, DornerWorks, Ltd. 13
Outline
I. Present State of SW Dev in AerospaceA. DO-178 and the waterfall approach
B. Who is doing Agile currently?
II. Introducing Agile to AerospaceA. DO-178 on Agile practices
B. Customizing Agile for Aerospace1. What is Agile?
2. Impacts on Software Development for Aerospace
III. Q&A
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Embedded Systems Engineering
DO-178
• Design Assurance vs. Process Verification
• Applying legacy processes to an agile
environment
– Planning and Certification processes remain
unmodified
– Planning documents see the most change
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Embedded Systems Engineering
Process Verification
• Requires fully exercise of software through input stimulation
• Exhaustive testing ensures that all
possible input/output combinations are identified during testing
• Since all I/O combinations are known, all errors can be identified and corrected
prior to certification
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Embedded Systems Engineering
Design Assurance
• Acknowledges difficulty of fully exercising software through inputs
• Addresses risks involved with non-
exhaustive testing by analyzing software for identified categories of errors
• Aims to simulate long time-in-field through rigorous testing and analysis
• Admits that not all errors will be addressed prior to certification
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Embedded Systems Engineering
DO-178 Waterfall Process
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Embedded Systems Engineering
DO-178 Agile Process
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Embedded Systems Engineering
Agile Impacts
• Insuring independence
– DO-178 requires independence where Agile
encourages co-operation
• Managing traceability
– The management of the traceability is not
inherent to Agile
• Achieving verification/validation
– Software testing is Agile, document
verification is Waterfall
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Embedded Systems Engineering
Addressing the Impacts
• Insuring independence– Agile practices do not preclude a process in which a
separate developer writes the tests for an implementation
• Managing traceability– Traceability is established early (end-to-end trace
after each iteration, exhaustive by last iteration)
• Achieving verification/validation– Documents (i.e. Requirements and Design) can be
generated and reviewed during each iteration
– A final coherency review would then be performed prior to certification
20(c) 2008, DornerWorks, Ltd.
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Embedded Systems Engineering
(c) 2008, DornerWorks, Ltd. 21
Outline
I. Present State of SW Dev in AerospaceA. DO-178 and the waterfall approach
B. Who is doing Agile currently?
II. Introducing Agile to AerospaceA. DO-178 on Agile practices
B. Customizing Agile for Aerospace1. What is Agile?
2. Impacts on Software Development for Aerospace
III. Q&A
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Embedded Systems Engineering
Agile
• Agile Methodologies
– Crystal
– Unified Process
– SCRUM
– Extreme Programming (XP)
• Agile Techniques
– Test Driven Development
– Refactoring
(c) 2008, DornerWorks, Ltd. 22
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Embedded Systems Engineering
Agile Key Practices
• Continuous delivery
• Welcome changing requirements
• Customer/developers work together daily
• Build around motivated individuals with necessary environment and support, trust to get job done
• Face-to-face conversation most effective communication method
• Progress measured by working software
• Sustainable pace
• Technical excellence and good design
• Simplicity
• Self-organizing teams
• Regular team reflection/adjustments to become more effective
• Risk-driven iterative developmentSummarized from http://agilemanifesto.org/principles.html and Larman, Agile & Iterative Development, Boston: Addison-
Wesley, 2004.
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Embedded Systems Engineering
SCRUM Key Practices
• Self-directed and self-organizing teams
• Fixed length iterations
– Client-driven adaptive planning at start
– No external addition of work to an iteration, once
chosen
– Daily stand-up meeting with special questions
• What have you done since last meeting?
• What will you do before next meeting?
• What is blocking progress?
– Demo to external stakeholders at end
From Larman, Agile & Iterative Development, Boston: Addison-Wesley, 2004.
(c) 2008, DornerWorks, Ltd. 24
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Embedded Systems Engineering
XP Key Practices
• Planning game
• Small, frequent releases
• System metaphors
• Simple design
• Testing
• Frequent refactoring
• Pair programming
• Team code ownership
• Continuous integration
• Sustainable pace
• Whole team together
• Coding Standards
(c) 2008, DornerWorks, Ltd. 25
From Larman, Agile & Iterative Development, Boston: Addison-Wesley, 2004.
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Embedded Systems Engineering
Test Driven Development
(c) 2008, DornerWorks, Ltd. 26
• System tests written first
• Unit tests written before code
• Automated
• Organic, symbiotic
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Embedded Systems Engineering
Refactoring
(c) 2008, DornerWorks, Ltd. 27
• Improvement of existing effort (code, tests,
documentation) that was likely considered done
• Developer’s prerogative: Small changes achieved within iteration/sprint
• Larger changes prioritized in iteration/sprint
planning
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Embedded Systems Engineering
(c) 2008, DornerWorks, Ltd. 28
Outline
I. Present State of SW Dev in AerospaceA. DO-178 and the waterfall approach
B. Who is doing Agile currently?
II. Introducing Agile to AerospaceA. DO-178 on Agile practices
B. Customizing Agile for Aerospace1. What is Agile?
2. Impacts on Software Development for Aerospace
III. Q&A
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Embedded Systems Engineering
Ranking
No unique challenges
Minor challenges
Difficult
Impossible
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Embedded Systems Engineering
Agile Key Practices
Continuous delivery
Welcome changing requirements
Customer/developers work together daily
Build around motivated individuals with necessary environment and support, trust to get job done
Face-to-face conversation most effective communication method
Progress measured by working software
Sustainable pace
Technical excellence and good design
Simplicity
Self-organizing teams
Regular team reflection/adjustments to become more effective
Risk-driven iterative development
3030(c) 2008, DornerWorks, Ltd.
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Embedded Systems Engineering
SCRUM Key Practices
• Self-directed and self-organizing teams
• Fixed length iterations
– Client-driven adaptive planning at start
– No external addition of work to an iteration, once
chosen
– Daily stand-up meeting with special questions
• What have you done since last meeting?
• What will you do before next meeting?
• What is blocking progress?
– Demo to external stakeholders at end
(c) 2008, DornerWorks, Ltd. 31
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Embedded Systems Engineering
XP Key Practices
Planning game
Small, frequent
releases
System metaphors
Simple design
Testing
Frequent refactoring
Pair programming
Team code ownership
Continuous integration
Sustainable pace
Whole team together
Coding Standards
(c) 2008, DornerWorks, Ltd. 32
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Embedded Systems Engineering
Test Driven Development
(c) 2008, DornerWorks, Ltd. 33
System tests written first
Unit tests written before code
Automated
Organic, symbiotic
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Embedded Systems Engineering
Refactoring
(c) 2008, DornerWorks, Ltd. 34
• Improvement of existing effort (code, tests,
documentation) that was likely considered done
• Developer’s prerogative: Small changes achieved within iteration/sprint
• Larger changes prioritized in iteration/sprint
planning
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Embedded Systems Engineering
Conclusions
(c) 2008, DornerWorks, Ltd. 35
• DO-178 Waterfall leads to problems
• Agile methodologies address many of the failings
of Waterfall
• Agile methodologies can be applied to Aerospace
software development, three challenges are:
• SOI Reviews
• Formal Documentation
• Contracts: Firm Fixed vs. Time & Materials
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Embedded Systems Engineering
(c) 2008, DornerWorks, Ltd. 36
Outline
I. Present State of SW Dev in AerospaceA. DO-178 and the waterfall approach
B. Who is doing Agile currently?
II. Introducing Agile to AerospaceA. DO-178 on Agile practices
B. Customizing Agile for Aerospace1. What is Agile?
2. Impacts on Software Development for Aerospace
III. Q&A
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Embedded Systems Engineering
Acknowledgements
The authors gratefully acknowledge the help and advice of
the following individuals:
• Dewi Daniels, Deputy Head of Consultancy, Silver Software
• Nick Papageorgis, Director of Advanced Technology, GE Aviation Systems
• Leanna K. Rierson, Digital Safety Consulting, FAA DER
• Timothy Skutt, Software Architect, GE Aviation Systems
(c) 2008, DornerWorks, Ltd. 37