One of the main findings of the current thesis is the fact that psychosocial factors such as life events and low social support are not primarily predictors of subsequent mood symptoms, but also... Show moreOne of the main findings of the current thesis is the fact that psychosocial factors such as life events and low social support are not primarily predictors of subsequent mood symptoms, but also seem to occur as a result of mood symptoms . Over the last decades longitudinal studies have proven their great value for research in BD. These studies provided ample knowledge about the bipolar disease course and its associated factors. The current study contributed to this knowledge by adding different research approaches to analyse and interpret these complex longitudinal associations. These results implicate that it is difficult, and maybe not even very useful, to determine cause and effect when studying the ongoing interaction between the course of bipolar disorder and psychosocial factors. Consequently, models in which strict monocausal directions of causality are abandoned might lead to a closer approximation of the reality of the disorder and its complex interactions with the environment. The network approach may turn out to be a suitable statistical method to analyse and understand such complex associations. Show less