Halliday & Matthiessen (1999: 157):
The Range rôle is quite pervasive; it can occur in all types of figure that are construed as self-agentive, and also in certain figures of being that are construed as other-agentive. The Range construes the range or domain of the actualisation of the Process, with reference to taxonomic scope (as in play : play tennis / volley ball), spatial scope (as in climb : climb mountains /hills) etc.