Agricultural extension in developing countries faces many challenges. The main challenge for public institutions, the implementers of agricultural extension services, is that they have weak implementation systems to support farmers. On the other hand, the main challenge faced by beneficiary farmers is low agricultural productivity and income. Against this backdrop, the Japan International Cooperation Agency (JICA) launched an initiative to promote “agriculture as a business” by strengthening the agricultural extension systems of developing country governments, beginning with a technical cooperation project implemented in Kenya from 2006 to 2009. The agricultural extension method developed in this project is the Smallholder Horticulture Empowerment and Promotion (SHEP) approach. The SHEP approach is supported by two theoretical pillars: promoting farming as a business (economics) and empowering and motivating people (psychology). A series of activities fulfilling these two pillars is the innovative originality of the SHEP approach. These activities are practiced according to four steps to promote market-oriented agriculture while motivating smallholders to improve their farming operations. In Kenya, horticultural income of target farmers increased through the practice of “grow to sell.” Following this result, the SHEP approach has spread across Africa through the Tokyo International Conference on African Development (TICAD), benefitting 256,546 small-scale farmers in 30 countries to date. In countries where the SHEP approach was implemented, in addition to the outcomes of increased horticultural productivity and income, many impacts were identified that contributed to improved farmers’ livelihoods, including repairing or building houses, purchasing mobile phones and vehicles, installing electricity in homes and funding children’s education. Since TICAD VII in 2019, JICA has been working with African governments, development partners, private companies and relevant organizations to promote the transition to profitable agriculture through the SHEP approach with the goal of achieving better lives for one million smallholders by 2030. This has led to the utilization of the SHEP approach in various forms, and its effectiveness and versatility has been recognized. However, inadequate government agricultural extension budgets and farmers’ high expectations for the provision of agricultural inputs raise the bar for intervention in the SHEP approach. The SHEP approach, however, is not a “panacea” that can solve all agricultural extension challenges in developing countries. Nevertheless, in order to continue agricultural and rural development programs/projects that promote farmers’ self-reliance, it is essential to continue to extract the outcomes and impacts of the SHEP approach at the field level and disseminate the effectiveness of the approach widely. Key words: agricultural extension, market-oriented, SHEP approach, smallholder, JICA, technical cooperation, Kenya, income