In this study were aimed to investigate of theoretical dimension of readiness concept that is very important factor and nature of pre-requisite for learning and teaching processes. This purpose in this study were emphasized readiness, important of readiness, important of determinig of readiness level, cognitive, social and educational aspects of readiness, important of readiness according to learning theories. In addition findings of researches about readiness that take part in national and international literature were investigated and expressed. The result of study, as a remarkable result are thought that pre-school education-oriented studies are to be more.