Communication audit is a relatively new field of research, which has so far been investigated from a managerial point of view. Linguists have not yet researched it. This book summarises existing, mainly managerial, approaches to communication audits and brings to the forefront a linguistic perspective on them. It showcases that their essence is to capture and assess the actual communication behaviour of auditees. The proposed communication audit model, communication audit procedures, and linguistic form sheet can be applied and further developed by scientists interested in taking on research into communication and by practitioners who wish to conduct communication audits in practice.