Organizational structure is a system that consists of explicit and implicit institutional rules and policies designed to outline how various work roles and responsibilities are delegated, controlled and coordinated. Organizational structure also determines how information flows from level to level within the company. For example, in a centralized structure, decisions flow from the top down, while in a decentralized structure, the decisions are made at various different levels.

Organizational structure, stated simply, defines a specific hierarchy within an organization, and businesses of all shapes and sizes use it heavily. A successful organizational structure defines each employee's job and how it fits within the overall system. This structuring provides a company with a visual representation of how it's shaped and how it can best move forward in achieving its goals. Organizational structures are normally illustrated in some sort of chart or diagram.

Four types of common organizational structures are implemented in the real world. The first, and most common, is a functional structure. This is also referred to as a bureaucratic organizational structure and breaks up a company based on the specialization of its workforce. Most small-to-medium sized businesses implement a functional structure. Dividing the firm into departments consisting of marketing, sales and operations is the act of using a bureaucratic organizational structure.

The second type is common among large companies with many business units. Called the divisional or multi-divisional structure, a company that uses this method structures its leadership team based on the products, projects or subsidiaries they operate. A good example of this structure is Johnson & Johnson. With thousands of products and lines of business, the company structures itself so each business unit operates as its own company with its own president.

Flatarchy, a newer structure, is the third type