Across the four Dutch Lexicon Projects, participants made lexical decisions about real Dutch words and made-up nonwords. In DLP1, participants responded to visually presented lowercase words and nonwords; in BALDEY, participants heard stimuli and decided as quickly as possible whether each was a word; DLP2 used visual lexical decision; and in the Dutch Crowdsourcing Project participants saw 70 words and 30 nonwords and indicated which items existed in Dutch.