The invention is related to systems and methods for creating an application call from an application definition. In certain embodiments, these systems and methods can be used to facilitate the testing of web services. According to one embodiment, a method for testing web services is provided. The method can comprise receiving application identification information from a user, wherein the application identification information includes the location of an application definition, accessing an application definition, which can be stored locally or on a remote computer, reading the application definition to determine a function and at least one variable element associated with the function, and prompting a user to enter data for each variable element requiring user input.