This document provides an overview of transitivity and theme/rheme analysis in systemic functional grammar. It defines transitivity as how meaning is represented in clauses and how speakers encode their view of reality. It describes the key components of transitivity processes - processes, participants, and circumstances. It outlines six major process types: material, mental, relational, behavioral, verbal, and existential. For each process type, it defines the participants and provides examples. The document also analyzes the participants and process types used in different parts of the short story "Heroic Mother".