The key to the successful use of a communication plan is to start it before the implementation of the final solution or change in the process.
Start with a realistic evaluation of the the people and groups that have or could have an influence on the outcome of the project.
Look at both people and groups. The end user group is one that should be considered.
Break them down into Positive, Negative or Neutral groups about the project or solution. Then evaluate them by their level of impact. In this case you see the end users are at best neutral and they have a high level of impact. Take any group that is Neutral or Negative and has a Medium to High level of potential impact and develop your communication plan for each.
From that point it is a sales job. Take the WIIFM approach. What's in it for me. What are the end users going to get out of the improvement? Then constantly communicate the status, involve them in the solution and communicate all wins back them to build support.
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