text: Creating a test is a complex and time-consuming process, so experts either inside or outside the organization should be involved if a decision is made to create rather than purchase a test. Employers develop their own tests for a variety of reasons such as cost effectiveness, test security concerns, company culture, position uniqueness, and other factors. The need to develop a test is often based on a cost/benefit analysis. This analysis addresses the cost to develop and use ones own test compared to buying someone elses test and paying to use it over the life of the instrument.