It is preferable that the manager do this independently without outside help, but if the challenge is too great it may mean the manager bringing in a professional to help the departments see face-to-face on the various key issues. Endeavor too would go into creating a set of goals and plans to reach those goals that would be acceptable to all. Creating these goals would, therefore, take the input and opinion of each of the key members of each department. My goal throughout would be to build trust and to work towards having the five different departments build their communication. Dealing with the individuals in a dignified, respectful way, and allowing the different parties to air their concerns is recommended. Once done, the units can focus on productivity.

This case is also similar to the merger of two companies and therefore a lesson, congruent to mergence, may be applied here: Organizations, like people, possess personalities: mergence of two companies with different cultural backgrounds involves the settling of operational issues such as politics, personnel policies,...

The manager, too, in this case may have to resolve all of this by around -- the -table discussion if he aims for convergence of goals and direction. Once done, the remaining issues are comparatively minor.
Finally, implementing change in any organization involves constant monitoring of effect and consequences of the change as well as ability to take effect. In this case, each of the five very different departments will be involved. Data collection via feedback from managers or supervisors of the various sites should be employed so as to analyze and correct any possible strategy errors that may consequent during the process of change. In short, communication should be the manager's most intensive and consistently employed tool. Management of each department should be in touch with the entire organization, and if the manager's strategy does not go according to plan, changes should be made to the strategic plan at the outset or instantly when recognized before worse consequences ensue.