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OPS.9:4.4 - Obtain the least burdensome discriminating basis

Select the basis appropriate to the claim and decision:

  • A resource/precedence bound can establish infeasibility under explicit demand, capability, calendar and acceptance assumptions. Show a feasible schedule as well when claiming that a proposed treatment makes the result achievable.
  • Event-history replay can reveal starvation, blocking, rework and timing relations. Its observational explanation remains limited by event quality and unobserved conditions.
  • A bounded field probe changes one consequential mechanism under the applicable professional Method and permission. State the comparison cases or windows, preserved conditions, interference, expected observations and stopping rule.
  • A specialist causal or scheduling analysis is warranted when uncertainty, confounding or coupled behavior can reverse a consequential decision and the simpler basis cannot resolve it.

For a probe, keep the same accepted-result criteria and record demand, mix, resource availability and consequential conditions. Shared queues or common providers can affect nominal comparison cases too. Use an appropriate time-blocked, matched or other justified comparison; a convenient before/after label does not remove interference or confounding.

Current FPF C.16 governs the measurement chain and C.28 governs what causal use the basis supports. The operation still has to supply the actual measurement or probe, the professional premises and its observations.