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C.40.CD:3 - Forces
| Force | Tension |
|---|
| Receiving need and changed question | A tractable subproblem can help while leaving part of the need unresolved. |
| Source success and target conditions | Reuse saves work; a changed condition may invalidate one constituent or its result. |
| Exploration and affordability | A revealing attempt can open new work, while an unbounded programme of variants consumes the means to use its results. |
| Challenge validity and difficulty | An unfamiliar task may be meaningful but unsolved; a malformed task can waste effort under the same appearance of difficulty. |
| Retained result and receiving capability | A construction can be shared while its next user still needs an operation, tool or skill. |