1. A computer-implemented method of facilitating analysis of the operation of a transactional server system, the method comprising: identifying a first performance parameter for which measurement values indicate a degradation in performance of the transactional server system as seen by end users; identifying a plurality of additional parameters for which a predefined dependency relationship exists with the first performance parameter, wherein each of the additional parameters is associated with a particular potential source of the performance degradation; analyzing measurement values of each of the plurality of additional parameters to evaluate a likelihood that each such additional parameter is associated with the performance degradation; and presenting to a user an indication of which of the additional parameters is likely associated with the performance degradation to assist the user in identifying a root cause of the performance degradation.