625 ENGLISH SUMMARY ecological model, a person is embedded in an ever-widening circle of systems that all exert their influence on that person. Systems of influence can include school, social groups, or sports clubs. Decisions made at the government level, the spatial layout of the environment, or parents’ work can also affect a person’s development. In this context, the concept of relationship therefore means ‘exerting influence on’ or ‘being connected to’. Finally, we pay attention to the normative and subjective relationship between the observer and the observed. What meaning does the observer attribute to the observation, in this case, the ‘movement’? The attribution of meaning to movement is not objective but is determined by the subjective individual who observes and experiences the movement of another. In scientific circles, subjectivity is often seen as unscientific, and efforts are made to achieve the most objective observation possible. However, we want to explicitly allow for the fact that every observation is subjective and normative, including the observations of the therapist regarding the client. So how can we deal with this subjectivity? This is where phenomenology comes in, as it proposes an attitude that, free from any prejudice, investigates the phenomenon that presents itself (Kunzmann et al., 1998). It requires to temporarily suspend our subjective judgment and to simply experience and realise that it is our own subjective experience of the other’s movements. A subjective description of a movement is ‘person X walks slowly’. An objective description would be ‘person X walks slower than person Z’. The third pillar on which the method is ‘self-understanding’. A healthy development of self-understanding requires “connection with others,” “exercising autonomy,” and “experiencing a sense of competence”, as put forward in Deci and Ryan’s (2000) SelfDetermination Theory (SDT). A lack of any of these needs leads to a decline in mental health, similarly to the growth of a plant, that needs water, sunlight, and soil to grow and flourish. Lack of any of these three leads to a decline in the vitality of the plant. The starting point of SDT is that satisfying these needs forms the inner drive or motivation of every individual and prompts goal-directed behaviour. People want to be autonomous, connected with others, and feel competent in what they do. This sets people in motion and forms the driving force behind human actions. Systemic Development Perspective Having explained the pillars of our method, the next step is to justify our view on development. How do people and organisms develop, and what paths does that development take? Is development predictable, and can the outcome of an intervention be predicted? A view on development encompasses various aspects, some of which we will discuss. First, a view of development is related to the level at which development is observed. Development seems to occur on a global level, following universal milestones that A
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