Farmer organizations (FOs) are groups established by farmers to support members' individual and collective interests through representation and services. FOs differ in their scale, functions, and legal structures, ranging from national federations to local associations that focus on advocacy, economic support, or local development. Farmer-to-farmer extension involves training provided by farmers to other farmers, often establishing farmer trainers who may be volunteers, paid a fee, or receive a stipend or salary depending on their relationship to sponsoring organizations or those they serve.