The leading thought of the research at hand was the idea that bringing together situa-tional leadership theories with theories of adult education will result in a synergy effect. The final goal was to put up a science-based synergetic model for adult education and specifically for the teaching of statistics. To achieve this objective, the study underwent different stages. First, different theories both for situational leadership (including con-tingency models) and adult education were presented. From all adult educational mod-els, the study pursued primarily Knowles’ (1980, 2005) andragogy. The model consists of excellent measurable properties of adult education and was therefore very suitable for an empirical analysis. Thus, the research analysed andragogy by doing a validation study first and then tried to find contingent or situational patterns of andragogy. In or-der to collect the necessary data for this analysis, a questionnaire was designed that con-tained items about adult and self-directed learning. One hundred nineteen persons took part in the survey, and the corresponding data were then analysed. The results con-firmed the major postulates of Knowles’ principles on adult education. They also showed that the need for andragogy is not uniformly distributed. One major finding of the research was the clear support of the assumption that the cultural process of grow-ing up is lagging behind the biological coming of age. This observation could be con-firmed by a recent study on American adolescents (Twenge, Sherman, & Wells, 2016). This is a very significant conclusion because it shows that andragogical principles are not equally appropriate for all age groups. So age is certainly a contingent element. Oth-er important contingent elements were self-directed learning behaviour, self-concept, and affiliation to a specific group, like student, employed researcher, or doctoral fellow. Based on these distinctions, the second stage of the research could uncover four levels of learning maturity levels, each denominating a group with more or less need for adult educational principles. To complete the model, a teaching style was proposed for each level of maturity. The teaching styles were partly derived from the situational leadership model (SLT) from Hersey, Blanchard, and Johnson (2008). SLT, similar to Knowles’ (2005) andragogy, is a very structured model, and this helped define clear teaching styles in analogy to SLT. Though the teaching styles draw many of their attributes from SLT, they have at the same time a very distinct foundation in the theory of adult educa-tion, as well as didactic theories. The two components (maturity level and teaching styles) together allowed the putting up of a model for lecturers of statistics and general-ly for the teaching of adults. As the model is built on different stages of maturity of andragogy, we call this model the Staged Andragogical Model (SAM). Within the framework of SAM, lecturers can find guidelines for teaching adults. Additionally SAM helps to identify different stages (or groups) of adult learners, which eases the control over the normally heterogeneous adult learning groups. Thus, SAM is an ap-plied model and has the potential of offering the adult educator a practical teaching tool.