1. A method of a computer system predicting a performance shortage of a first application of the computer system, the method comprising: monitoring, with the computer system, at least one performance parameter of the first application to generate first performance data; using said first performance data to compute a mathematic function with the computer system describing a time dependent development of said performance parameter wherein the mathematic function incorporates second performance data from a second application that corresponds to the performance parameter of the first application; computing and assigning to said mathematic function with the computer system a quality indication value; using said mathematical function to compute with the computer system a point in time when the performance parameter will exceed a selected threshold; and outputting with the computer system a prediction signal when said quality indication value is higher than a selected quality threshold and said point in time lies within a pre-determined timeframe, wherein said prediction signal indicates that a performance shortage of the application is expected near said point in time.