SYSE.48:4.2 - Construct the implementation or packaged procedure

Parameterize values that legitimately vary: subject identity, measurements, units, source edition or applicable regime. Validate them against the actual operation rather than guessing from the example trace. Preserve state preconditions and uncertainty about prior effects.

Compose supported primitives, design the physical layout or packaged instructions, or generate a software candidate and inspect it. Check dependencies, hidden constants, access needs and failure paths. For a packaged procedure or worksheet, supply the varying positions, required human operations, available means and observable completion in a usable form. For a software operator, the model can remain fixed.

State accepted inputs, effects or supported actions, outputs, error returns and compatibility. Use SYSE.26/.27 for the software operator’s supported interaction and recovery. Reject missing or unsupported inputs with a useful return. For an effectful operation, preserve attempt identity and recovery; do not turn a lost reply into an automatic replay.