Studies oriented towards what is stable and/or what varies or changes deal with: the compatibility ratio between (procedural and lexical) constructions, the grammatical function of simple or complex lexemes, as well as variation (by polysemy or analogy/similarity), constructional change or (grammatical / procedural or lexical) constructionalization of verbal/verb-nominal constructions. We investigate argument structure constructions, referentiality and simple and complex predicators. It is understood that individual and socially shared linguistic knowledge are both stable and subject to variation and change.