The chapter lays the foundation for the understanding of usage events and utterance types. Usage events consist of several components, all of which can become conventionalized and entrenched: utterances (including the required motor and sensory activities), communicative goals of participants, cognitive and interpersonal activities, and the linguistic, situational, and social context. Utterance types are contingent links between communicative goals and linguistics forms. They are contingent on several dimensions: the onomasiological link between goals and forms, the semasiological link between forms and meanings, combinations on the syntagmatic dimension, and the use of utterance types in cotexts and contexts. Utterance types can be defined as multiply contingent and probabilistic connections between goals and forms. Three classes of utterance types can be distinguished with regard to their function, specificity, and size, i.e. distinctors, units, and patterns. Although the notion of utterance types is similar to that of construction, it is preferred to emphasize the dynamic and contingent nature of form-meaning relations.