Don't let perfect be the enemy of better: In defense of unparameterized megastudies.

The target article argues researchers should be more ambitious, designing studies that systematically and comprehensively explore the space of possible experiments in one fell swoop. We argue that while "systematic" is rarely achievable, "comprehensive" is often enough. Critically, the recent popularization of massive online experiments shows that comprehensive studies are achievable for most cognitive and behavioral research questions.