Quality assurance and fidelity management
To ensure that the CBR intervention is of adequate fidelity, each district will be assigned a coordinator to monitor the delivery of CBR sessions in the three sub-districts from intervention arm every month. The intervention coordinators will record and rate the key contents of the CBR sessions such as interactions between CBR workers and participants, the ways of module presentation, etc., according to a specially designed rating scale. Regular meetings will be held to provide feedback for improving the delivery of the intervention to all CBR workers to maintain quality benchmarks of the trial. Any significant divergence from the intervention manual will lead to suitable corrective action to harmonize the intervention across the sites.To ensure the adequate quality of outcome measurements in the baseline, intermediate and endline survey, three procedures of supervision will be implemented. First, all the interviews, including both the part of primary care physicians and will be sound recorded (after obtaining the consent of participants), the records will be directly sent to team researchers and experts in psychiatry (for symptoms and function assessment) every day for quality control purpose. Any divergence from the protocol norms will lead to communication with data collectors for correction, and significant errors will lead to re-interview for outcome measurements. Second, each district will be assigned a coordinator to monitor 20% interviews of every sub-district through randomly onsite visits. The coordinator will provide feedback based on a specially designed assessment form to the team researchers. Third, researchers will also conduct casual inspection to check the quality of 10% of the finished questionnaire and assessment through the online platform. The submitted questionnaire will be sent back to data collector for re-check if any illogical error was found. A weekly group meeting with data collectors, researchers and experts in psychiatry will be held to ensure the interview norms and to achieve the overall quality benchmarks.