Precontemplation is the stage at which there is no intention to change behavior in the foreseeable future.

Contemplation is the stage in which individuals are deciding whether or not there is a need to take action to correct the problem.  Do the pro & cons of change outweigh the pro & cons of maintaining the status quo? 

Preparation is a stage entered into once the individual decides there is a need to take some action.  Specific plans of action are developed in this stage as the individual chooses among alternative potential solutions.

Action is the stage in which individuals put their plans into action and change their behavioral patterns.