According to me four basic requirements for overcome resistance to change are...
1.Problem – There must be a recognized reason to change. If the you feels no pain in maintaining the status quo, there is no fundamental reason to consider change.
2.Vision – There must be a vision of what the improved state should look like. Without such a view into the future state, people will be stuck feeling both the pain of the issue and the frustration of feeling that it cannot be improved.
3.Action – It is usually the case that the vision of the future is too difficult to achieve in a single step. Unless it is possible to define that next step to move closer to the vision, people are usually unable to break the inertial pull of inaction. Breaking down the path to the vision overcomes this problem. Interestingly enough, it is often the case that the full path doesn’t need to be defined. Knowing the next step provides enough confidence in the future to make it seem possible.
Cost – The pain of change must be perceived as lower than the pain that is being removed through change.