Which type(s) of evidence collection is required with a formal TMMi assessment?

For a formal TMMi assessment, both staff interviews and document study are required to collect sufficient evidence. The assessment must adhere to the TMMi Assessment Method Accreditation Requirements (TAMAR), which state that formal assessments require the corroboration of interview data with documentary evidence (artifacts). These can include documents, templates, or screenshots, ensuring that the evaluation is robust, repeatable, and auditable​​.