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Software Behaviorby Joost van der Zwan
Index

Framework · Sequence · from Chapter 10

Product-Level Technical Fluency

Names the minimum technical surface area a product builder needs to reason about quality without disappearing into implementation.
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The framework

Fig. · Product-Level Technical Fluency
  1. Inputs: What information, events, or user actions does the system depend on?
  2. Transformations: What happens to those inputs before the user sees a result?
  3. Outputs: What does the system return, show, store, trigger, or change?
  4. Constraints: What limits shape the system: permissions, latency, data, cost, policy, or reliability?
  5. Risks: Where could the system produce harm, confusion, false confidence, or broken trust?
  6. Feedback loops: How does the system learn, update, or respond to user correction?
  7. Failure modes: How does the experience behave when the system is wrong, slow, missing data, or unavailable?
  8. Evaluation: Which representative cases, must-act and must-not-act constraints, outcome checks, and final-state checks establish acceptable behavior?
  1. 01

    Inputs

    What information, events, or user actions does the system depend on?

  2. 02

    Transformations

    What happens to those inputs before the user sees a result?

  3. 03

    Outputs

    What does the system return, show, store, trigger, or change?

  4. 04

    Constraints

    What limits shape the system: permissions, latency, data, cost, policy, or reliability?

  5. 05

    Risks

    Where could the system produce harm, confusion, false confidence, or broken trust?

  6. 06

    Feedback loops

    How does the system learn, update, or respond to user correction?

  7. 07

    Failure modes

    How does the experience behave when the system is wrong, slow, missing data, or unavailable?

  8. 08

    Evaluation

    Which representative cases, must-act and must-not-act constraints, outcome checks, and final-state checks establish acceptable behavior?

4 · Do

How to use it

Apply to a feature before design hardens. Include controlled evaluation, prohibited actions, and final-state verification. The output is a technical question map: the unknowns that could change the product call and who can answer them.

5 · Save

The Product Architect · Product-Level Technical Fluency

Framework · Sequence