With the recent advancements in technology, the work-life boundaries have blurred affecting the performance of the employees while catching the attention of the researchers as well as the practitioners. The purpose of this study is to conduct a review on the work-life-balance-theories and their evolution over the last century while discussing the development of the concept from work-lifebalance to work-life-integration. The relationship of work and family has been evolved drastically over
the years, which resuledt in the development of new theories for exploring this changing relationship. The paper will introduce the progression in work and family relationship by describing the historical factors that led to the recent development in this field. The underpinning theories of work-life-balance are then reviewed from the two perspectives of work-life-conflict and work-life-balance.