6. Case studies can be useful tools for exploring user requirements for software tools, but they present challenges: given a small number of cases, your results may not be generally applicable. Some user requirements from a case study might be easy to implement with minimal impact on a designthese might be included even if they are not of broad interest. Other requirements might require fundamental changes to system design. How can you be confident that you have gained a thorough, general understanding that is suitable for designing an application of broader interest? If additional cases are not available, how might you use other HCI research techniques to bolster your confidence in the results of your case study?