I agree with Anthony Monaco that the choice of an organization structures depends on the size of the company. I must also add that the type of structure chosen also depends on the aims and the type of industry that an organization operates in. It is important to note that poorly designed organizational structures will often lead to inefficient and sluggish communications. Well-designed structures, on the other hand, will lead to efficient communication thus encouraging fast and clean decisions. I also agree with jtl27 that functional organization structures are the most effective. This structure happens to be most commonly used, and it employs a top down approach with high ranking executives at the top. In this structure, departments are run separately by department heads who report to top level managers. This structure is easy to understand, but it can be frustrating in instances where the executive at the top is poorly organized.