What is the significance of the case notes in the OET writing task?

The case notes in the OET writing task are vital because they provide essential information needed to write effectively. They contain specific details about the patient's medical history, symptoms, and relevant social background, all of which are necessary for producing a clear and informative referral letter or report. The notes are designed to guide the writer in including pertinent information that ensures the recipient can understand the patient's situation thoroughly and respond appropriately.

This option emphasizes the role of case notes in contributing to the clarity and relevance of the content, ensuring that essential details are communicated in a professional and accurate manner. The other options, while they may touch on elements of the case notes, do not capture their primary purpose: to serve as a comprehensive source of information that informs the writing task directly.