Methods/design: This trial investigates 3 different types of how to customize a well-introduced CBT-protocol using dyadic peer tutoring methodology (primings). The individuals with GAD are randomly assigned to 3 priming conditions (resource priming vs. supportive resource priming vs. adherence priming). Participants' treatment allocation is performed randomly, therapist's assignment to the peer tutoring partner and the priming condition is based on mutual agreement. Treatment outcomes are assessed at following levels: Observer based in-session outcomes, post-session outcomes from session 1 to 15, treatment outcome at post assessment and at 6-months follow-up assessments.