in the context of this guideline, non-facilitated self-help (also known as pure self-help or bibliotherapy) is defined as a self-administered intervention, which makes use of written or electronic materials based on the principles of CBT and of an appropriate reading age. The intervention usually involves minimal contact with a practitioner (for example an occasional short telephone call of no more than 5 minutes) and includes instructions for the person to work systematically through the materials over a period of at least 6 weeks.