in annotating the function of word forms rather than just their morphological form, and as coarse-grained as necessary in order to minimize pragmatic interpretation and resulting inconsistencies in manual annotation.
some word classes had to be grouped together under one category, especially in cases where the annotation would have strongly relied on the interpretation of the annotator or where word forms actually are ambiguous, for example backchannel signals, responsives and interjections (NGIRR).