RMP.6:5.4 - Two useful examinations and ten days

A research team has ten available investigator-days. Two proposed credibility examinations each need four to six days of non-overlapping effort from that same team. Supplied bounds do not exclude six plus six.

Do not select the pair as an obtainable ten-day programme by separately comparing six plus four and four plus six. Determine whether one examination can answer the current credibility question, whether the arrangement can change, or whether the present answer should retain uncertainty without the pair.

A provider then supplies a qualified shared-preparation arrangement that bounds the combined effort to eight days while preserving both discriminating comparisons. The feasibility answer changes. Reassess the contribution, remaining limits and displaced work before selecting the now obtainable programme; eight days is not itself evidence that the tests are worth doing.