The article discusses the development theory in tourism, specifically focusing on the third world countries. It highlights how tourism has become a significant sector for these countries to improve their national income and quality of living. The development theory approaches mentioned include modernization, dependency, neo-liberalism, sustainable development, human development, and post-development. These approaches aim to promote economic growth by leveraging science and technology, entrepreneurship, and environmental sustainability. The article also touches on the advantages and disadvantages of tourism, as well as its three main models: enclave, structural, and traditional. It provides examples from Fiji, Cook Islands, and Tonga, highlighting their unique characteristics and contributions to their respective economies.