Naturally work is divided in an organisation. This is called the division of labour. It is the separation of work processes into a number of tasks and each task is assigned to a group or an individual. This gives birth to specialization, through which individuals or groups can excel at doing one thing at a time. This happens because they usually do one task over and over again. This may also result in boredom and lack of creativity from the workers side as the task might be repetitive.
Businesses also have to decide where the decision making power resides in the heiracrchy of the organizational structure. Some organisations have a centralised structure which keeps the decision making power at the top of the hierarchy. Then there's decentralised structure where decision making is spread out to include more junior level employees.