The program implementation means installing the software on the user system. The installation needs post installation configurations at the user system. The program will be tested for profitability and to check how it adapts to the system.The integration of the software is also done in the process of implementation to resolve any issue related. The program is integrated with libraries, other programs and databases which is the stage of SDLC to be included in integration of the program with the outer entities. The implementation process of the program or the software involves all the post sale procedures which operates properly in the environment provided by analyzing the requirements, setting up the configuration, customizing it, running, testing the software, integrating the system, providing training to the user, delivering and finally making changes when necessary. The development team might face some challenges in implementation of the software. These challenges are: The code reusability which involves reusing the code which was earlier developed or created for some other software application in the organisation. The programming languages are very sophisticated and require well equipped library functions. The cost reusability is to cut down the cost of the end software. This issue is faced in largely by the coders for the purpose of compatibility checking and to decide what percentage if code will be reuse. The another challenge is the version management because each time a new software is provided to the user or the customer the maintenance of the version and configuration is required to handle by the developers. The documentation related to configuration is also needed to be provided to the users accurately and in time. The software program developed in the company or organisation is designed for to support the host machine at the user end so in those times sometimes it is impossible to design the program to be working in the target host machine. The implementation process is a complex process requiring many tasks that involve many departments needed to achieve the task in sequential manner. The use of proven methodologies and expert professional guides are needed to help through the process of implementation. However, the lack of proper planning may result in the failure of the implementation of the program in the first stages of the process because of not sufficient resources or the problems not seen before may arise. The IT implementation begins with a contact negotiation with the vendor using a procedure that sets guidelines and payment modes of the overall implementation process. The requirements may include the system performance and issues regarding the implementation of the software and the support of the vendor in case of future emergencies.