The second data type is based on the gradient acceptability judgment tests in all four languages. The stimuli mainly consist of theoretically decisive wh-, cleft-, focus- and scrambling constructions. 
Persian and French participants took part in a paper-and-pencil experiment in which they read stimuli on a test sheet and expressed their judgments by drawing a line. 

In order to also account for phonological factors, a gradient acceptability judgment test with auditory stimuli was developed for Spanish and Catalan. The test was a randomized computer-based version of the previous paper-and-pencil version. The participants read and listened to a test sentence and rated it on a continuous scale.