Customized SOA (CSOA) application is just like customized software for any organization with absolute nothing or minimum involvement of human effort. CSOA application provides only services to any small organization. A provider can offer this type of application to relevant organization. Considering CSOA constraints, a method is needed for its development to overcome limitations associated with other methodology for developing CSOA application. This Thesis aims to describe technique for analysis, design and construction of CSOA applications known as BOSM (Business Oriented Services Model). BOSM for CSOA is a development framework which uses the discipline and practices of SOMA and RUP for the proper management of utilizing the basic characteristics of SOA such as reusing existing services, changing existing service with less effort, adding new services at any time, developing new services with future plan, etc.