From the beginning of the 21st century, most countries throughout the world have been involved in employment problems and challenges. As a social problem with negative implications on countries economy, job deficit has been a hurdle in the way of economic development. Meanwhile, new-emerging businesses known as start-ups serve as a solution for the employment problem of countries. Different factors influence the development course of such businesses. The aim of this study was to explain the influential factors of start-up development in developed countries. Studies on start-up development revealed that the role of idea, investor, working team and the location of start-ups cannot be ignored in the process of start-up development.