SPECILAL FOR INTRODUCTION OF PHYSCHOLOGY
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Organization change; refers to the adoption of new behavior by organization so as to increase the organizational effectiveness for achieving its objective. According to kurnt lawns who were introduced three stage of organization change theory on (1951) which are more relevant to nowadays. These stages include unfreezing, moving (changing) and refreezing. Thus unfreezing is the first stage in organization change which involves preparing individual in an organization to accept that change is necessary. Moving (varying) these are second stage which involves a shifting in behavior of organization by modifying system, process, technology and people. And last stage are Refreezing which involve action to derive for change and facilitate the institutional process of the change even a day to day routine of the organization. So a school as organization system adopts this stage in order to improve the education performance. Due to these stage which was used with different organization so as to adopt change ,there following below are contribution of lewins three stage of organization change  which involve strength and weakness .By starting with strength as follows.
It help all individual in organization to understand the change so as to achieve the organization goals; Due to unfreezing stage it enable everyone in a certain organization like school which include head of school, all teacher, school board, and students understand through elaborating more about what change concern, in order to make every one being aware about that change so as to reduce resistance change. For example the head of school want to make a change about teaching method which is participatory method. So head of school must elaborate more about what the meaning, purpose and way to follows in order to make sure that everyone understands in order to accept and to bring development.
It helps organization to archive their goals. Through these three stage of organization change it enable a school to archive their goals by planning, organizing, and adapting the change so as to drive the organization goals. For example in school there is different change adapted especially at university which are using computer, and projector as the way to facilitate learning process so through these change enable school to get more information and tend to  adopt new technological change for the purpose of achieving their goals.
It leads to solve the problem facing organization. The change which was tended to adopted by different organization it help to solve the problem facing the organization and improving more quality and quantity of production. For example education system in Tanzania tends to adopt the technological process as the way of improving the rate of performance and increase the competition of education in world wide. Also to increase the science teacher among the school so as to increase the rate of performance in science subject in school. Hence through these change enables to reduce and solve the problem that was exist. There following below are weakness caused by lewins three stage of organization change as follow.
It lead to rise of conflict among the people in organization, these occur when individual are forced to change whether by reward or punishment , such situation when happen it create misunderstanding among the organization and lead to low rate of performance in organization. For example when the head of school introduce some opinion like to make donation for all staff member in order to help student to perform well but some other teacher ignore these opinion because of strong reason so it create misunderstanding between head of school and it subordinate.(Judson,A.1991)
It lead to identification and internalization, identification occur when individual recognize one among of various model provided in the environment that is most suitable to their personality. And internationalization occur when individual are forced to encounter a situation that call a new behavior, so through these situation the change its difficult to be adopted because people having character of returning to traditional one especially in education system in Tanzania through introducing DIVISION  and GPA in form four results (Kambuga,2013)
All in all there are following above are the contribution of lawns three stage of organization change which based on education system, so as organization should use these stage effectively during the change was needed by providing information to all member in organization in order to reduce resistance force about that change and increase in provision of services which are quality especially in school performance.
Reference.
Judson, A. (1991).changing behavior in organization: minimizing resistance to                                     change. Cambridge, MA: Basil Blackwell.
“Lewinschangemanagementmodel”retrievedfrom http://www.midtools.com/pages/articles/newPPM_94.htm
Robbin,S.(2003).organization behavior.(10thEd).uppersaddle,river,NS:Prentice hall
Kambuga, Y.(2013).introduction to educational management and school administration: Dodoma, Tanzania.LAP LAMBERT Academic publishing.