This booklet details a methodology for infusing almost any subject into a school district's ongoing curriculum. The process involved three interrelated parts: infusion, community, and stewardship. The infusion component makes it possible to upgrade teacher's skills, improve classroom management, strengthen community-school cooperation, and diffuse knowledge and techniques throughout the school system with little or no disruption to existing programs. In the community component, teachers and students work together to identify community resources and use them as part of their learning environment. A major component of the ECOS process, stewardship has been defined as the development and application of a system of management; a major objective of stewardship is to involve participants, faculties, students, and community members in personal responsibility for the solution of local problems through community action. The total plan also includes strategies for dealing with change and innovation, techniques for staff development, and an evaluation plan. The application of the ECOS process in curriculum development is discussed, and specific guidelines are provided for the areas of envlronmental, career, energy, nutrition, consumer, drug and alcohol, gifted, and special education. (Author/JEG)