This final thesis describes the currently available processes for testing security threads in banknote papers. The currency market has generally two types of security threads, embedded and window threads.  It is generally important to optimize the adhesive used. This requires a test method with good precision and low operator independence. By achieving and using good test methods the process of evaluating a new products pros and cons can be done with higher precision. The thread adhesion properties are of great importance when developing new adhesion systems. The main reason for testing the threads adhesion is to verify that the thread cannot be removed in an intact form from the banknote but also for product development processes.  The current test methods were developed by introducing new parameters and sample preparations specifications. The data evaluation system was also upgraded.  The measurement of thread adhesion vs. position in CD and vs. time showed expected results. A new and more reliable test method was implemented and evaluated and was together with the improved current method able to detect same properties independently.