The Investigation Division is mandated to examine and investigate cases of suspected wrongdoing relating to the Council of Europe in accordance with its legal framework.

An investigative process, detailed in the Rule on investigations, is a fact-finding process aimed at establishing whether wrongdoing, as defined in the Speak Up Policy, has occurred. It consists of gathering, securing, and examination of evidence aiming to establish facts substantiating or refuting allegations, and may consist of several stages (including initial consideration, preliminary assessment, and investigation).