23 September 2021

The Scrum framework : Sprint

The Scrum framework consists of Scrum Teams and their associated accountabilities, artifacts, events and rules as defined in the Scrum Guide.

Scrum events

Sprint definition

Sprint purpose

Sprint as a container

Sprint time-box

  • Sprint is a time boxed Event of 30 days or less
    • They are fixed length Events of one month or less.
    • At least every calendar month (4 weeks).
    • Sprints are limited to one calendar month or shorter.
    • The length of a Sprint thus could be weekly, biweekly or monthly.
    • 2, 3 or 4 weeks.
  • Sprint should be short enough to keep the risk acceptable to the Product Owner.
    • When a Sprint’s horizon is too long the Sprint Goal may become invalid, complexity may rise, and risk may increase.
    • Shorter Sprints can be employed to generate more learning cycles and limit risk of cost and effort to a smaller time frame.

Sprint participants

  • All members of the Scrum Team share in the accountability for creating value every Sprint.

Sprint practice

  • Sprints contain and consist of five parts, work and 4 mandatory Events :
  • There is just regular Sprint in Scrum within which the Developers tries to create releasable Increment.
    • Therefore, there are no such things as Sprint Zero, Hardening Sprint, Stabilization Sprint, Integration Sprint, etc.
    • Scrum does not acknowledge:
      • Hardening Phases.
      • Sprint 0 (there is no such thing as Sprint 0)
      • Technical Sprints that consists only of tasks which help reduce the technical debt and do not add any functionality to the Product.
  • Sprint is the sole Event that can not be finished or over earlier or later than its predefined time-box duration.
    • Other Events are time-boxed but can be finished earlier if the team achieves each event’s goal.
    • On the other hand, it is possible the Team finishes all selected Sprint Backlog Items and tasks before the Sprint time-box, but the Team should continue the Sprint until the end of the related time-box through accepting new Items from the Product Backlog by negotiating with the Product Owner.

Sprint rules

  • A new Sprint starts immediately after the conclusion of the previous Sprint.
    • A Sprint begins right after the previous Sprint ends and ends depending upon the length of the Sprint.
    • There is no gap or work done between Sprints.
  • The duration of a Sprint is fixed and cannot be shortened or lengthened.
  • The Product Backlog is refined as needed; and,Scope may be clarified and renegotiated with the Product Owner as more is learned.
    • No changes are made that would endanger the Sprint Goal;
  • Quality does not decrease;

Sprint and Product Backlog refinement

Sprint progress

  • Various practices exist to forecast progress, like Burn-Down Chart, Burn-Up Charts, or Cumulative Flow Diagrams (CFD).
    • While proven useful, these do not replace the importance of empiricism.
    • In complex environments, what will happen is unknown.
    • Only what has already happened may be used for forward-looking decision making.

Sprint Impediments

  • What happens if the Developers cannot complete its work by the end of the Sprint ?
    • The Sprint ends on time and the team learns what is possible to accomplish in that sprint length.
  • What happens if part of the work in a cancelled Sprint is potentially releasable ?
  • May we cancelled the Sprint ?
    • Sprint could be cancelled if the Sprint Goal becomes obsolete.
    • Only the Product Owner has the authority to cancel the Sprint.
  • What happens when a Sprint is cancelled by the Product Owner ?
    • Completed/”Done” PBIs are reviewed, incomplete PBIs are re-estimated and put back on the Product Backlog.

Scrum framework

More informations for the Scrum PSD certification here.

Updated : 03/09/2021

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