Discussion: High level functional goals need to be refined and non-functional softgoals need to be refined and operationalized. The Main tasks that are connected to the goals using Means-Ends Links need to be refined to lower level tasks. As well, the refined softgoals need to be operationalized to lower level tasks. All these lower level (leaf) tasks constitute the actual system requirements. The level and depth of the refinement, however, depend on some factors such as, the efforts that need to be spent in modeling, the scalability of the model, and the purpose of the model. Therefore, the modeler might try to acquire low-level requirements, or sometimes only assess high-levels options.