In a comparative study of concatenative and nonconcatenative morphology in ASL and ISL, we have found clusters of properties that seem to characterize each type. Partly through an analysis of the lexical structure of verbs, some predictions can be made about certain types of morphology (in particular, verb agreement) in sign languages in general.
Cross sign linguistic differences are seen as the result of morphological processes that are universally available to all languages, spoken or signed.