The Stockholm Cancer Prevention Program is to our knowledge the first community intervention program in the world aiming of a reduction in the incidence of cancer. A community diagnosis model has been used in the planning. A thorough description of different organizations in the local communities of Stockholm has been made. A model for describing the organizations or collaborators has been worked out, including description of the organizations and its environment, objectives of activities, possible activities to reach the objectives, resources needed, incentives for collaborative partners, formative evaluation criteria and anticipated problems and solutions. The main method of description has been by use of keyperson interviews. This was found to be a good method to reach commitment to the program.