In this comprehensive report, Rebecca Horn, Mental Health and Psychosocial Support Specialist, records the results of the consultancy project, which aimed to identify the MHPSS evidence-building activities taking place within the Movement, the common barriers and challenges as well as factors supporting evidence-building activities. In addition, an MHPSS Evidence-Building Toolkit and Repository have been published alongside the findings and include an array of tools and resources to overcome common barriers and challenges.