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These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, Software Engineering: A Practitioner’s Approach, 6/e Chapter 4 Agile Development Software Engineering: A Practitioner’s Approach, 6/e Chapter 4 Agile Development copyright © 1996, 2001, 2005 R.S. Pressman & Associates, Inc. For University Use Only May be reproduced ONLY for student use at the university level when used in conjunction with Software Engineering: A Practitioner's Approach. Any other reproduction or use is expressly prohibited.

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, The Manifesto for Agile Software Development “We are uncovering better ways of developing software by doing it and helping others do it. Through this work we have come to value: Individuals and interactions over processes and toolsIndividuals and interactions over processes and tools Working software over comprehensive documentationWorking software over comprehensive documentation Customer collaboration over contract negotiationCustomer collaboration over contract negotiation Responding to change over following a planResponding to change over following a plan That is, while there is value in the items on the right, we value the items on the left more.” Kent Beck et al

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, What is “Agility”? Effective (rapid and adaptive) response to change Effective (rapid and adaptive) response to change Effective communication among all stakeholders Effective communication among all stakeholders Drawing the customer onto the team Drawing the customer onto the team Organizing a team so that it is in control of the work performed Organizing a team so that it is in control of the work performed Yielding … Rapid, incremental delivery of software Rapid, incremental delivery of software

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, An Agile Process Is driven by customer descriptions of what is required (scenarios) Is driven by customer descriptions of what is required (scenarios) Recognizes that plans are short-lived Recognizes that plans are short-lived Develops software iteratively with a heavy emphasis on construction activities Develops software iteratively with a heavy emphasis on construction activities Delivers multiple ‘software increments’ Delivers multiple ‘software increments’ Adapts as changes occur Adapts as changes occur

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, Principles of Agility 1. Highest priority is to satisfy the customer through early and continuous delivery 2. Welcome changing requirements, even late in development 3. Deliver working software frequently, from a couple of weeks to couple of months, with a preference to the shorter timescale 4. Business people and developers must work together daily throughput the project 5. Build projects around motivated individuals;

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, Principles of Agility 5. Give them the environment and support them 6. The most efficient and effective method for conveying information to and within a development team is face-to-face conversation 7. Working software is the primary measure of progress 8. Agile process promote sustainable development. The sponsor, developers, and users should be able to maintain a constant pace idefinitely

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, Principles of Agility 9. Continuous attention to technical excellence and good design enhances agility 10. Simplicity – the art of maximizing the amount of work not done – is essential 11. The best architectures, requirements, and design emerges from self organizing teams 12. At regular intervals, the team reflects on how to become more effective, then tunes and adjusts its behavior accordingly

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, assumptions of Agility 1. It is difficult to predict in advance which software requirements will persist and which will change. It is equally difficult to predict how customer priorities will change as a project proceeds 2. For many types of software, design construction are interleaved. That is, both activities should be performed in tandem so that design models are proven as they are created. It is difficult to predict how much design is necessary before construction is used to prove design 3. Analysis, design, construction, and testing are not as predictable (from planning) as we might like.

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, Extreme Programming (XP) The most widely used agile process, originally proposed by Kent Beck The most widely used agile process, originally proposed by Kent Beck XP Planning XP Planning Begins with the creation of “user stories” Begins with the creation of “user stories” Agile team assesses each story and assigns a cost Agile team assesses each story and assigns a cost Stories are grouped to for a deliverable increment Stories are grouped to for a deliverable increment A commitment is made on delivery date A commitment is made on delivery date After the first increment “project velocity” is used to help define subsequent delivery dates for other increments After the first increment “project velocity” is used to help define subsequent delivery dates for other increments

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, Extreme Programming (XP) XP Design XP Design Follows the KIS principle Follows the KIS principle Encourage the use of CRC cards (see Chapter 8) Encourage the use of CRC cards (see Chapter 8) For difficult design problems, suggests the creation of “spike solutions”—a design prototype For difficult design problems, suggests the creation of “spike solutions”—a design prototype Encourages “refactoring”—an iterative refinement of the internal program design Encourages “refactoring”—an iterative refinement of the internal program design XP Coding XP Coding Recommends the construction of a unit test for a store before coding commences Recommends the construction of a unit test for a store before coding commences Encourages “pair programming” Encourages “pair programming” XP Testing XP Testing All unit tests are executed daily All unit tests are executed daily “Acceptance tests” are defined by the customer and excuted to assess customer visible functionality “Acceptance tests” are defined by the customer and excuted to assess customer visible functionality

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, Extreme Programming (XP)

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, Adaptive Software Development Originally proposed by Jim Highsmith Originally proposed by Jim Highsmith ASD — distinguishing features ASD — distinguishing features Mission-driven planning Mission-driven planning Component-based focus Component-based focus Uses “time-boxing” (See Chapter 24) Uses “time-boxing” (See Chapter 24) Explicit consideration of risks Explicit consideration of risks Emphasizes collaboration for requirements gathering Emphasizes collaboration for requirements gathering Emphasizes “learning” throughout the process Emphasizes “learning” throughout the process

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, Adaptive Software Development

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, Dynamic Systems Development Method Promoted by the DSDM Consortium ( Promoted by the DSDM Consortium ( DSDM—distinguishing features DSDM—distinguishing features Similar in most respects to XP and/or ASD Similar in most respects to XP and/or ASD Nine guiding principles Nine guiding principles Active user involvement is imperative. Active user involvement is imperative. DSDM teams must be empowered to make decisions. DSDM teams must be empowered to make decisions. The focus is on frequent delivery of products. The focus is on frequent delivery of products. Fitness for business purpose is the essential criterion for acceptance of deliverables. Fitness for business purpose is the essential criterion for acceptance of deliverables. Iterative and incremental development is necessary to converge on an accurate business solution. Iterative and incremental development is necessary to converge on an accurate business solution. All changes during development are reversible. All changes during development are reversible. Requirements are baselined at a high level Requirements are baselined at a high level Testing is integrated throughout the life-cycle. Testing is integrated throughout the life-cycle.

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, Dynamic Systems Development Method DSDM Life Cycle (with permission of the DSDM consortium)

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, Scrum Originally proposed by Schwaber and Beedle Originally proposed by Schwaber and Beedle Scrum—distinguishing features Scrum—distinguishing features Development work is partitioned into “packets” Development work is partitioned into “packets” Testing and documentation are on-going as the product is constructed Testing and documentation are on-going as the product is constructed Work occurs in “sprints” and is derived from a “backlog” of existing requirements Work occurs in “sprints” and is derived from a “backlog” of existing requirements Meetings are very short and sometimes conducted without chairs Meetings are very short and sometimes conducted without chairs “demos” are delivered to the customer with the time-box allocated “demos” are delivered to the customer with the time-box allocated

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, Scrum

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, Crystal Proposed by Cockburn and Highsmith Proposed by Cockburn and Highsmith Crystal—distinguishing features Crystal—distinguishing features Actually a family of process models that allow “maneuverability” based on problem characteristics Actually a family of process models that allow “maneuverability” based on problem characteristics Face-to-face communication is emphasized Face-to-face communication is emphasized Suggests the use of “reflection workshops” to review the work habits of the team Suggests the use of “reflection workshops” to review the work habits of the team

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, Feature Driven Development Originally proposed by Peter Coad et al Originally proposed by Peter Coad et al FDD—distinguishing features FDD—distinguishing features Emphasis is on defining “features” Emphasis is on defining “features” a feature “is a client-valued function that can be implemented in two weeks or less.” a feature “is a client-valued function that can be implemented in two weeks or less.” Uses a feature template Uses a feature template the a(n) the a(n) A features list is created and “plan by feature” is conducted A features list is created and “plan by feature” is conducted Design and construction merge in FDD Design and construction merge in FDD

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, Feature Driven Development Reprinted with permission of Peter Coad

These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 6/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001, Agile Modeling Originally proposed by Scott Ambler Originally proposed by Scott Ambler Suggests a set of agile modeling principles Suggests a set of agile modeling principles Model with a purpose Model with a purpose Use multiple models Use multiple models Travel light Travel light Content is more important than representation Content is more important than representation Know the models and the tools you use to create them Know the models and the tools you use to create them Adapt locally Adapt locally