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Standard : Work is delivered in thin, testable slices

Purpose and Strategic Importance

Delivering work in thin, testable slices enables rapid feedback, reduces delivery risk, and supports a continuous flow of value. By breaking down features into minimal, valuable increments, teams can learn quickly, validate assumptions early, and reduce rework.

This standard supports the policies “Embrace Iteration over Perfection” and “Reduce Time from Idea to Impact” by promoting short learning loops, improving predictability, and ensuring that delivery aligns with evolving user needs.

Strategic Impact

  • Accelerates time to value and customer feedback
  • Enables early detection of design or requirement flaws
  • Reduces complexity and risk of large changes
  • Enhances team confidence through fast, incremental progress
  • Builds momentum and stakeholder trust through frequent, visible delivery

Risks of Not Having This Standard

  • Delivery is delayed due to large, hard-to-test batches
  • Risk accumulates when assumptions remain unvalidated
  • Feedback arrives too late to influence design decisions
  • Teams struggle to measure progress meaningfully
  • Rework and waste increase due to misalignment or missed expectations

CMMI Maturity Model

Level 1 – Initial

Category Description
People & Culture - Teams attempt to deliver whole features or projects before releasing.
- Progress is measured by effort spent, not outcomes delivered.
Process & Governance - Work is scoped around full feature sets or phases.
Technology & Tools - Limited support for managing small increments.
Measurement & Metrics - No visibility into partial delivery or feedback loops.

Level 2 – Managed

Category Description
People & Culture - Teams explore breaking work down but struggle with clarity or definition.
Process & Governance - Some effort to define MVPs or basic slicing in backlog refinement.
Technology & Tools - Tasks may be broken into subtasks but not value slices.
Measurement & Metrics - Rough tracking of story count or throughput.

Level 3 – Defined

Category Description
People & Culture - Teams regularly deliver vertical slices of functionality.
- Feedback is sought and acted on at every increment.
Process & Governance - Backlogs are groomed with slicing in mind; clear acceptance criteria.
Technology & Tools - Tools reflect end-to-end slices with delivery tracking.
Measurement & Metrics - % of work delivered in <1-week increments; cycle time consistency.

Level 4 – Quantitatively Managed

Category Description
People & Culture - Teams experiment with slice size and flow efficiency.
- Incremental delivery is a cultural norm.
Process & Governance - Definition of Ready/Done enforces testability and end-to-end value.
Technology & Tools - Tools provide feedback loop timing, slice size variance.
Measurement & Metrics - Lead time to value per slice; failure rate of large vs small slices.

Level 5 – Optimising

Category Description
People & Culture - Thin slicing is used to de-risk innovation and scale learning.
- Teams coach others on agile slicing and flow design.
Process & Governance - Continuous improvement targets flow of testable slices.
- Portfolio work is structured to reflect incremental delivery.
Technology & Tools - Slice flow metrics guide portfolio planning and team allocation.
Measurement & Metrics - % of hypotheses validated through early slices; reduction in rework due to early validation.

Key Measures

  • % of work delivered in ≤1-week increments
  • Lead time from development start to production release
  • Number of slices per epic/feature
  • % of slices that result in actionable feedback
  • Change failure rate for sliced vs batch-delivered work
Associated Policies
Associated Practices
  • Iterative Learning Cycles
  • Incremental Delivery of Value
  • Small Batch Releases
  • Progressive Elaboration of Work
  • Backlog Refinement as a Team Practice
  • Definition of Ready and Done
  • Thin Slicing of Work
  • Value Slice Validation

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