1.1
Tall organization- this is one which has many levels of hierarchy. In these organizations there are usually many managers and each manager has a small span of control – they are in charge of only a small groups of people. In tall organizations there are many layers of middle managers between top management and employees. This can slow work down and more it overly bureaucratic. Tall structure are most commonly found in more complex or larger organizations ,when many decisions need to be taken at a lower level and executives concern themselves with only the larger decisions. Good example for tall structure is NHS. In this organization the management is on high levels, a lot of bureaucracy

Reference: (http://khijji.blogspot.co.uk/2014/03/tall-organizational-structures-vs-flat.html )

Flat structure- The flat structures have fewer management levels with each level controlling a broad area or group. Flat organizations focus on empowering employees.
For example organizations with flat structure are Mont Rose College, Charity organizations or small companies.
Centralisation and Decentralisation structures- In Centralisation and Decentralisation structures decision- making is about authority. In centralized structures need office will retain the major responsibilities and power. Conversely decentralised organisations will spread responsibilities for specific decisions across various outlets and lower level managers, including branches or units located away from head office. An example of a decentralised structure is TESCO and EBAY. Each store of TESCO has a store manager who can makes decisions in their store. Centralisation means that the Head office keeps the main responsibilities of decision-making of the organisation. Head management have the control, making decisions and using regular methods for the good of the company. For example for this structure are