Abstract: A system for monitoring a process of performing professional services. Data, representing measured values of a parameter of the process, are plotted as a time series with respect to control limits computed from historical variation in the process. The data series, and the control limits, may reflect differences between an observed value of a parameter of the process and actual values. The process parameter, for example, may be a cost of providing professional services. One or more signals may be detected based on the data and computed control limits and, in response to detecting such a signal, corrective action may be triggered. Such corrective action may include adjusting the process of providing professional services, identifying and correcting errors causing deviations from an expected process or changing predictions of costs or identifying deviations from an expected process for performing the professional services.