in majority of reading exercises which are included in the Primer we already know the text in advance we already know what utterances could be considered as correct lectures and which not to every specific exercise - like vowel or syllable recognition – Primer associates a specific language model (scorer) which constraints the connectionist temporal classification (CTC) beam search to restricted amount of exercise-relevant answers significantly constraining the search space of plausible solutions INNOVATION 1 : implementation of exercise-specific scorers transforms a generic ASR problem (difficult) into multi-class classification problem (easier)