Our work focuses on process of software testing with the regard on his control and quality securing. Theoretical part explains basic terminology used later in our work. It explains the terms such as quality, process control management or software. Later our work describes software testing in relation with methodology of software development, quality improvement of process testing with the usage of model TMMi and modelling of processes. Project part consist of process analysis of current state of software testing process. Identified subprocesses are modelled and inserted into Process Cards. Identified imperfections are then subjects of solution proposal for improvement of software quality control testing process. Afterwares the proposal is implemented on the current state of software testing process with the goal to achieve second level of software testing process maturity according to model TMMi.