Pseudorandomization

Definition: The process of setting up an order of experimental trials/runs/sessions/conditions or an assignment of participants to specific (sub-)groups or treatments that is randomized, but with setting specific restrictions due to experimental considerations or subgroupings (i.e., not every order or assignment is possible). For example, when trials of the same condition should not be presented three times in row, one might choose an order that fulfills this condition, but is otherwise random. This process functionally approximates randomness, but is not completely random, as it excludes those orders that could have been generated randomly, but that show unwanted systematicity.

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Related terms: Quasirandom, Randomization