The effect of the Positive Assertiveness Training

INTERVENTION: 1. Positive Assertiveness Training (PAT): Grouptraining consisting of six weekly training sessions of two hours each; 2. Electronic Positive Assertiveness Training (ePAT): Electronic training. Consisting of six weekly modules of videos and text; 3. Control intervention: Waiting list. CONDITION: ; Loneliness, Social anxiety, Assertiveness, Shyness ; ; PRIMARY OUTCOME: 1. Assertiveness;; ; 2. Empathy. SECONDARY OUTCOME: 1. Happiness; ; ; 2. Self‐esteem. INCLUSION CRITERIA: 1. Older than 18; 2. Able to speak and read Dutch to an extent where an interpreter is not needed for completion of the questionnaires and the training; 3. Symptom Check List 90 Revised‐score lower than 169 for males or lower than 203 for females ‐Gives informed consent.