What are the positive effects of the well thought out success plan and the negative?

Communication Plan
Visit http://www.hrsa.gov/healthit/toolbox/healthitimplementation/implementationtopics/buildworkforce/buildworkforce_8.html.
The experts explain that a communication plan should describe needs and expectations. It should also be specific to need to know parties, as well as being consistent and timely. Why do you think this is this so important? What are the positive effects of the well thought out success plan and the negative?
150-200 words