Today, Multinationals are integrating customers in their product development process in order to make customers more satisfied and to improve the performance of the whole supply chain. Thee case is reverse with the Small and Medium sector of developed and even under-developed countries. Specially in Pakistan, SMEs use to avoid customer integration due to many reasons i.e. lack of resources, lack of awareness, lack of interest, lack of technology etc This Book will provide a comprehensive description of different barriers to customer integration due to which many of the multinationals and SMEs faced shut down.