The purpose of the research is to determine the causes of failure of information systems development projects. We came to the hypothesis that rewarding can improve the success of information systems development projects. For this reason, it is suggested that employment contracts be tied to business results. Extrinsic and intrinsic rewards are a good motivator that affects the improvement of employee performance, i.e. increases productivity, business results and job satisfaction and contributes to increasing the success of information systems development projects. Designers and managers of information systems development projects who participated in the research, gave their views on the impact of rewards on the success of the information systems development project in response to survey questions. The attitudes were evaluated on a five-point Likert scales. We obtained additional data based on conversations with managers and designers who deal with the development of information systems. Through the research design, we determined an independent variable related to the employment contract based on business results, which is the basis for the application of various forms of remuneration, and a dependent variable related to the success of the information systems development project. The main findings of the research are related to the definition of the contract between the owner on the one hand and managers and designers on the other hand, which solves the problems of opportunistic behavior of managers and designers of information systems development project. In addition, the factors of extrinsic and intrinsic rewards that are most often used to motivate managers and designers of information systems development are defined. The practical implications of the research refer to the benefits that the company owner, managers and designers of the information systems development will have. They will receive the best model of employment contract for employees working on the development of an information systems project. In addition, they will receive information about the views of designers and project managers related to reward factors that improve the success of the information systems development project. The originality of the research refers to the creation of a model that links the work contract based on business results with reward factors that help to increase the success of the information systems development project.