Stress-dependent phase transformations (SDPT) and transformation-induced plasticity (TRIP) of steel are some of the reasons for distortion of workpieces. Investigation and modelling of SDPT and TRIP in the framework of thermal treatment are very active fields of research. Because of the complexity of the material response of steel it is necessary to investigate model approaches for effects like TRIP or SDPT in an isolated manner in model situations. We present a strategy for investigation of TRIP and SDPT via evaluating the data obtained for steel probes in simple experiments like uniaxial tensile or torsion tests. The effects of TRIP and SDPT can partially be separated. Using the results obtained under constant temperature and loading we can test the material behaviour under time-dependent conditions. This information can be integrated in complex models on material behaviour in order to simulate the behaviour of work-pieces in real situations such as heat treatment example.