This document discusses the concept of transitivity and theme/rheme in Systemic Functional Linguistics (SFL). It explains that in SFL, language is organized around three metafunctions: ideational, interpersonal, and textual. Transitivity deals with the ideational metafunction and involves processes, participants, and circumstances. There are six main types of processes: material, mental, relational, behavioral, verbal, and existential. The document provides examples and definitions for each process type.