C.32.MWA.PP:4.8 - Compare complete changes at proportionate effort

Use one current baseline, declared horizons and decision-changing scenarios. Compare each candidate’s result and resource consequences, including the transition from the incumbent. C.11.CRC supplies the comparison; C.11 supplies the authorized choice.

First distinguish an unavailable arrangement from a costly but possible one. Then retain the coordinates that could reverse the choice. These can include useful results, capability retention, delay, participant effort, qualified scarce time, money, continuity, autonomy, dependence, error exposure and future flexibility. Compare contributions to their actual receivers. A lower supplier cost that makes client performance impossible is not a cheaper equivalent service.

Do not add unlike ordinal scores to manufacture a winner. A candidate can be worse for one participant or horizon and still be selected through an explicit legitimate trade-off. Protected conditions retain their force. If the options promise materially different results, return to the strategic choice rather than silently treating them as equivalent staffing alternatives.

Challenge the sensitive premise. If common provision appears cheaper only when demand exceeds a certain level, compare lower demand. If local provision works only with a qualified leader, compare their absence. If AI eliminates a bottleneck only with unavailable data or authority, preserve that conditionality. Use the changed condition to revise or reject the candidate, not merely to add a warning.

Separate an ordinary operational check, specialist advice or monitoring, and an independent conclusion required by the receiving decision. Do not add the last contribution merely because another view might be interesting. When it is required, its obtaining conditions belong in the alternatives and their whole cost. Competence and spare time do not establish independence, access or a usable reporting route.

For example, a common service is qualified to support the practice, but its designer also promises an independent conclusion about that service while controlling the evidence released and permission to report a failure. The supported work may remain feasible while that promised conclusion is unavailable. Compare an existing sufficient engagement, an obtainable qualified arrangement with suitable safeguards, or a narrower reliance permitted by the decision’s obligations. Outsourcing the report or naming another colleague does not by itself supply those conditions. Section :4.9 gives the corporate case its direct supplier.

Apply C.11.DUA before commissioning more inquiry. Name a plausible answer that would change the arrangement or permitted reliance; compare obtaining it with a smaller reversible start, a narrower promise, existing evidence, delay or stopping. Include the recipient’s interruption and transition costs as well as the architect’s analysis. A binding assurance obligation remains binding until legitimately changed, but an optional attractive proposal does not entitle its author to an unlimited validation programme.

The decision can select a complete available arrangement, authorize a discriminating bounded attempt, retain alternatives pending one exact supplier result, revise the remit or stop. A comparison is not a decision by format. Preserve the chosen trade-off and the material return condition in the ordinary result needed by the participants.

Keep the decision within its evidence and authority. A non-causal capacity comparison can warrant a bounded trial while an effectiveness claim remains unsupported. Consume a causal-use result only within its verdict boundary. A selected proposal establishes no obtaining ArchitectureRelation, and a possible-future assignment supplies no actual performer occurrence.

Implementation and trial are separate Work choices. Retaining an adequate incumbent, or keeping a proposal available under stated conditions, can finish the comparison. Select additional Work through C.11.DUA only when its obtainable contribution warrants its full burden and the needed access, allocation, authority and window can be supplied. Carry observations that could support or defeat the proposed relations, protected conditions, stop and recovery into that choice. After enactment has begun, recovery preserves performed history; it is not a return to an earlier alternative as though the intervening Work never occurred. Section :5.3 makes that difference explicit.