75 Randomized controlled trial of a social network intervention 3 of) the baseline assessment. A computer-generated block randomization schedule provided by Castor Electronic Data Capture (EDC) is used. The allocation ratio will be 1:1 to ensure that an equal number of patients will be allocated to either TAU or FNC. Researchers will not have access to the randomization schedule and will be blind to block size and order. Blinding for treatment after randomization is not possible, as the content of treatment will be clear to both patients and therapists. Blinding researchers is not feasible due to different assessments of the conditions and required coordinating activities – referring patients to FNC and monitoring – of researchers during the FNC intervention. The experimental intervention starts preferably within 2 months after completion of the baseline assessment and ends 12 months after baseline assessment. During the intervention, patients in both FNC and TAU condition will be assessed at 3, 6 and 9 months after baseline assessment. At the end of treatment (12 months) and follow-up (18 months) additional questionnaires will be administered. Figure 1 provides an overview of the trial design. Two supplemental measures, the Work Alliance Questionnaire (WAV-12) and a qualitative interview, will only be assessed in the experimental group. Table 1 provides an overview of all instruments and the corresponding time of assessment. Forensic network coaches will receive an e-mail with a request to fill in one online questionnaire at 3, 6, 9 and 12 months after baseline assessment. In addition, after termination of the experimental intervention at 12 months, forensic network coaches will be interviewed face-to-face to measure program integrity and coaching experiences. Audio recordings will be made of every qualitative interview with both patients and coaches. Besides, researchers fill in questionnaires about patients in both conditions, at 3, 6, 9, 12 and 18 months after baseline, based on observations during assessment and information from the electronic patient file. Registered criminal recidivism data at 12 and 36 months after baseline will be requested by a researcher after termination of the study. All assessments with patients – interviews and questionnaires – will be conducted face-to-face, using both paper and pencil and online questionnaires using Castor EDC. The research assistant will help participants with possible problems and difficulties during assessments. The data collection process will be carefully monitored. All patients and forensic network coaches will be frequently motivated by research associates to complete the assessments. If necessary, patients and coaches will be reminded via the phone or e-mail. If necessary, the assessments can also be completed by phone. All patients will be compensated with a gift card of €10,- after each assessment at 3, 6, 9 and 12 months.
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