All regulations are published in the form of official information circulars. In principle, the regulation which is applicable for you is the regulation that was valid at the time of your enrolment. However, it is also possible that a subsequent regulation will apply retrospectively for you. The specific scope of applicability can be found in the regulation itself. If you have questions about the regulations, please contact your Examination Board.
The basic regulations for studying, teaching and examinations are set out in the Study and Examination Framework Regulations for Bachelor's and Master's Programmes at HTW Berlin [PDF].