At the heart of any change management lays the problem of transition. The transition to be brought about might be large or small in scope and scale, and it might focus on individuals or groups, on one or more divisions or departments, the entire organization, or one or on more aspects of the organization’s environment. 
At a conceptual level, the transition problem is a matter of moving from one state to another state. This transformation is typically accomplished as a result of achieving three types of goals: transform, reduce, and apply.
Transform goals are concerned with identifying differences between the two states. I will call the first stage as unfreeze second change and the third refreeze.
Reduce goals are concerned with determining ways of eliminating these differences which occur while the transition take place from one state to another.
Apply goals are concerned with putting into play operators that actually effect the elimination of these differences.
The transition problem can be further treated as smaller problems having to do with the how, what, and why of change.

Transition as a “Why” Problem
Transition as “What” Problem
Transition as “How” Problem
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