Socio-technical transitions (to sustainability) are a special research topic, because they are about
relatively rare, long-term macro-changes. Since they do not frequently occur, it is difficult to construct
large databases that can be analysed statistically for relationships between variables. Other types
of theories and methodologies are therefore needed. These theories should be multi-dimensional,
because it is unlikely that only one kind of causal factor or mechanism can explain entire transition
processes.