A TOR letter might be used to:
* Commission a study or report: Detailing the research questions, methodology, expected deliverables, and timeline.
* Outline the responsibilities of a committee or working group: Clarifying roles, decision-making processes, and reporting requirements.
* Define the scope of a consulting engagement: Specifying the services to be provided, deliverables, and payment terms.
* Establish the mandate for a new initiative: Describing the goals, objectives, and strategies for a new project or program.
While it might be *presented* as a letter (with a salutation and closing), its core function isn't communication in the typical sense of a correspondence, but rather a structured definition of tasks and expectations.