allocation-concealment

Allocation concealment is the set of procedures used in randomized controlled trials to prevent selection bias by keeping the upcoming treatment allocation sequence hidden from researchers and personnel who enroll participants. Parameters: (1) operates within randomized study designs where participants are assigned to intervention or control groups; (2) conceals the next allocation from the enrolling investigator; (3) prevents foreknowledge of assignment from influencing who gets enrolled or into which group. Persistence mechanism: standardized protocols in clinical research practice, enforced through institutional review and journal requirements. The practice persists through methodological training, regulatory guidance, and the reproducibility standards of evidence-based medicine. [formal: allocatio abscondita | substrate: behavior | horizon: a life | explicit: yes | epoch: 1.00]