Over the years, I have worked with Chief Executives seeking to get their organization's structure right. They have grappled with questions such as: Should we have a COO to oversee operations? Do we need Regional Directors to run areas of the country? What control should the national office have over local offices? To whom should the Development Director report? One way to answer such questions is to use objective criteria. For instance, a span of control greater than 6 or 7 is a stretch. Or, work conducted by senior people should be delegated down to those more junior wherever possible.
However, objective criteria alone cannot specify an organization's structure. There is the human factor to consider -- we all come with our idiosyncrasies. Take the case of a brilliant Program Director who is expecting a promotion to the COO position, but isn't strong in management and delegation skills. Moving someone else into the COO role could cause the Program Director to leave, while the promotion might cause him to flounder. A third option of assigning an excellent Project Manager to work with the Program Director in his new role could lead to success. Consideration of human factors -- the specific capabilities of the people involved -- leads to an improved solution.
An organizational structure solution may also be temporal -- its value having a shelf life. Because a given structure tends to optimize for some factors while attenuating others, using one structure for too long may cause problems to arise. To address this, organizations may alternate between different structural approaches. For instance, in a national organization with affiliates and a central office, a period of tighter central-office control aimed at reining in quality infractions may be followed by a more laissez-faire approach from the central office to stimulate local innovation. Organizational structures may oscillate over five-to-ten-year periods, first optimizing for one thing, then another.
Finally, it is useful to remember that a structural solution can only go so far in solving an organization's problems. People may need to be replaced, or training may be in order. Conversely, when an organization's staff is excellent, one of several different organizational structures may work just fine.