This special issue examines the question of how both formal(ist) and functional(ist) accounts or elements of theorizing can contribute to the explanation of (morpho)syntactic variation. Are formal and functional approaches really irreconcilable with each other, as often seems to be taken for granted by their respective advocates? It will be argued instead that they are rather complementary and that both can make a valuable contribution to explaining linguistic variation, in synchronic as well as diachronic respects. The integration of ways of looking at a certain phenomenon or problem from the respective other camp is proven to provide a significant added value and should not be excluded. The volume focuses on several Germanic languages and dialects, more specifically on German, Dutch, and Swedish varieties. It unites different formal and functional perspectives and, not least, it considers also semantic and phonological factors. The models covered include different versions of generative grammar, information-based morphology, construction grammar/construction morphology, natural morphology, and sociolinguistics.