Flow is a complex construct and has developed differently in different research fields. Some of the interpretations are included within this thesis and  categorized  in  two  main  perspectives:  (1)  the  individual  flow  perspective as defined in positive psychology and (2) the system flow perspective  based  on  notations  from  supply  chain  management,  lean  production,  construction  management,  and  operations  management. Both flow perspectives have at least one commonality which bases this thesis: to improve something towards a desirable condition. In positive psychology,  that  something  is  human  well‐being  and  the  system  perspective  focuses  on  entities  that  need  to  be  combined  to  facilitate production. Both flow perspectives have been developed independently without  clear  consideration  of  each  other,  even  though  several  theoretical sources indicate relevant relations between them. This thesis addresses that theoretical gap and aims to describe how system flows and  individuals’  flow  are  related  in  initiatives  intended  to  improve  production in house building.

The thesis is operationalized by a flow framework based on system flows and  individuals’  flow.  Within  three  different  cases  of  improvement  initiatives, qualitative data is analysed to exemplify how flow relations occur  in  the  researched  settings.  Findings  of  quantitative  patterns  of  traced  flow  relations  exemplify  flow  relations  and  can  inspire practitioners  in  assessing  how  the  different  flows  are  addressed  in  ongoing  improvement  initiatives  and  what  other  potential  flows  that could be addressed in future improvements. This thesis concludes that relations between flow on system level and flow on individual level can occur in improvement initiatives in house building production settings, thus  exemplifying  the  ‘Diversity  of  Flow  in  Production  Improvements  in  House  Building’.  Theoretically,  this  thesis  contributes  to  the understanding  of  the  flow  concept  in  construction  management, visualizes the diverse understanding of flow, and advocates that flow should not be treated as homogenous at any level.