Apparatus for use in a computer-based system for providing psychological therapy, the apparatus comprising: an access system configured to control access to features and data by users of remote devices, wherein the users comprise patients, therapists and supervisors; and a therapy system configured to enable text-based instant messages to be sent between patients and therapists; wherein the access system is configured to allow patients to retrieve messages sent and received by the patient, therapists to retrieve messages sent and received by the therapist, and supervisors to retrieve messages sent and received by particular patients and/or therapists.