This research study explored the implementation of School Learning Improvement Plans (SLIP) in one of the highlands districts of Papua New Guinea. A SLIP provides an implementation framework for promoting excellence in students learning and school performance. The rationale for the study was to identify strengths and weaknesses from the viewpoints of people involved in SLIP at the school level. Using mixed methods, data were obtained from selected primary school head teachers, senior teachers and assistant teachers. The study found that SLIPs were a highly effective strategy to get collaboration among stakeholders to plan for school improvement. Benefits to schools were seen to be provision of teaching and learning materials, focus on improved student learning, professional development for staff, infrastructure maintenance, good parent and community support and financial reporting. Responses varied in regard to the extent to which strategies were effective. Effective leadership was seen to be the key to success.