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Scrum with Joseph Pelrine: Part 2

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James Robertson

Posts: 29924
Nickname: jarober61
Registered: Jun, 2003

David Buck, Smalltalker at large
Scrum with Joseph Pelrine: Part 2 Posted: Apr 30, 2007 4:42 PM
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Heh - Being late from lunch to the first part, I missed the opening, where Joseph ran a video of an unmanaged - but efficient - traffic intersection. No lights, no signs, seeming chaos - but no accidents, and continuous flow.

So on to Scrum Practices:

  • Iterations of 1 to 4 weeks
  • Team builds functionality that includes product backlog and meets Sprint goals
  • Team self-organizes to achieve goals
  • Team conforms to existing standards and conventions
  • Abnormal termination of Sprint:
    • Team can cancel Sprint if the goal of the Sprint is deemed to be unattainable
    • Product owner can cancel based on external circumstances changing

An interesting heuristic for Sprint length: How long can management shut up and allow the team to work? Another interesting comment: "The purpose of meetings is to keep people from taking responsibility".

Product Owner:

  • Takes ownership of the backlog
  • Can be influenced by committees, management, customers, sales (etc)
  • Responsible for ensuring that the most important business functionality is delivered first
  • Ensures that one (and only one) set of requirements drives the project
  • Eliminates the confusion of multiple bosses, interference, etc

Scrum Teams:

  • Cross Functional
  • Selects the iteration goal and specific work results
  • responsible for committing to work
  • Self organizing
  • Authority to do whatever is required to meet goals
  • Open, co-located space
  • Demos work results to the Project Owner

Ideal team size: Seven +/-2. That's the largest size that can sit at a table and all engage in one conversation.

Scrum Master:

  • Responsible for establishing Scrum practices and rules
  • Representative to management
  • Representative to team
  • A coach
  • Engineering and Development skills
  • Agile version of IT project manager

The Lead developer really can't be in this role, due to conflict of interest issues. A Scrum Master can be defined as a "Servant Leader".

There are few roles and few practices - Scrum is low overhead. There's a Product Planning Meeting, where requirements emerge. From that, a product backlog gets put together - this consists of functional and non-functional requirements. Anyone can add to the backlog, but the Product Owner is the only one who prioritizes.

Estimates for work - like produce - have a "sell by" date, and that date is the end of a Sprint. At the end of a Sprint, the estimate will either be past (i.e., functionality delivered), or need revisiting. Joseph recommends this book: "Agile Estimation and Planning" by Mike Cohn, as a good source of information about how to do agile planning.

Scrum Planning Meetings:

  • What's on the backlog
  • What are the Team Capabilities (who can do this?)
  • What are the Business Conditions?
  • How stable is the technology? What's Changed?
  • Executable Product Increment (what did we do last Sprint)

The goal is to plan the next sprint.

Daily Scrum Meeting:

  • 15 minute status update - trick to get people there on-time: last in talks first
  • Same place/time every day
  • Meeting room
  • "chicken and pigs"
  • Three questions:
    • What did you do yesterday
    • What will you do today
    • Do you have any impediments blocking your progress?
  • Impediments and Decisions

Another thing here - Joseph recommends lightweight tools. Index Cards, Spreadsheets, web-based equivalents for distributed teams.

Sprint Review

  • What did we do?
  • Retrospective
  • New priorities set
  • Team devises solution to most vexing problems

Common complaints as to why "it won't work for us"

  • We don't have the right people
  • Requires business involvement
  • Project is too big for Agile
  • Project is too complex for Agile

In all these cases, there's a business problem. You know you're doing Scrum when "things come together" - you realize that you can start a project without all information, the team starts to work as a team of developers.

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