Abstract: A method for capturing requirements on a system and subsequently transforming the requirements into a test instruction for the system is disclosed. In a exemplary embodiment, a set of flows that captures the requirements of the system are created by repeatedly combining predefined templates of natural language text and populating them with information particular to the system and annotations to support identification of test data such as inputs to and outputs from the system. Based on the requirements specification a test instruction is prepared. This is done by first identifying points in the specified flow where input data must be provided or output data must be verified when testing an actual implementation of the specified system. By combining different specified flows and by giving the identified input and output data specific values a complete test instruction is created.