The collaboration between home and school is crucial for students' academic progress and socio-emotional growth. Teachers must learn how to establish and enhance this cooperation. Therefore, it is essential to include methods for creating and strengthening parental involvement in professional training programs for teachers. This study was conducted to explain the elements of teacher training programs in in-service courses concerning home and school collaboration. The research method was a systematic review and qualitative content analysis based on inductive reasoning. To obtain the desired data, the study reviewed literature and expert opinions in this field and analyzed existing programs in other countries. The findings indicate that the curriculum for parent involvement training emphasizes integrating theoretical and practical discussions of parent involvement in training courses and teaching specific skills. In terms of teaching-learning methods, it focuses on collective interaction, brainstorming, role-playing, case studies, and simulated experiences. The parent involvement training program considers the learner (teacher) as an element who should believe in the importance of parent involvement, have a positive attitude, and be capable and responsive to parents' needs. Regarding evaluation, it emphasizes the use of self-assessment approaches. It is recommended that this training course with the introduced elements be included in teachers' professional training programs to improve the educational system.