Systems thinking is abstract thinking. However, abstract thinking has a reputation for being difficult, at least more difficult than its opposite: concrete thinking. One stands for theory, the other for practice. After all, Kurt Lewin is said to have claimed that nothing is more practical than a good theory (Wegener et al. 2011, p. 47). This insight will be examined in more detail below because, as will become clear, thinking is always abstract by nature. As a result, access to the real world, i.e. to what is commonly associated with practice, is generally largely blocked. Nevertheless, the solutions to problems should prove themselves in the real world, i.e. in practice. The following considerations are intended to help close this gap between human thinking on the one hand and reality on the other, at least to some extent, in order to increase the probability of success of problem solutions beyond the level that can be achieved by chance or amateurish action.