This lecture covers some issues of load testing: performance evaluation of systems, charting, the use of alternative sources of data, comparison of the results obtained from different sources, a critical assessment of the findings, the analysis of the possible impacts on the result. In an easy to understand way it explains how to properly assess the performance of the system, what are the critical values necessary to investigate, how to move away from the hanging of system, and how to publish the result tests. The following instruments are used: Charles 3.7, Microsoft Visual Studio C# 2010 Ultimate. The visitors will find that you cannot trust one source of the information. All materials are both in the presentation and Word’s doc format. The rich illustrative material accompanies the entire lecture.