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I think I understand some part of this introduction but some part look confusing.
Organizational Structures is definitely a new are of learning.
Types of Organizational Structure
Types of Organizational Structure
Organizational structure refers to how individual and team work within an organization are coordinated.
To achieve organizational goals and objectives, individual work needs to be coordinated and managed. Structure is a valuable tool in achieving coordination, as it specifies reporting relationships (who reports to whom), delineates formal communication channels, and describes how separate actions of individuals are linked together.
Organizations can function within a number of different structures, each possessing distinct advantages and disadvantages. Although any structure that is not properly managed will be plagued with issues, some organizational models are better equipped for particular environments and tasks.
Building Blocks of Structure
What exactly do we mean by organizational structure? Which elements of a company’s structure make a difference in how we behave and how work is coordinated?
We will review four aspects of structure that have been frequently studied in the literature:
We view these four elements as the building blocks, or elements, making up a company’s structure.
Then we will examine how these building blocks come together to form two different configurations of structures.
Centralization is the degree to which decision-making authority is concentrated at higher levels in an organization.
In centralized companies, many important decisions are made at higher levels of the hierarchy, whereas in decentralized companies, decisions are made and problems are solved at lower levels by employees who are closer to the problem in question.
As an employee, where would you feel more comfortable and productive? If your answer is “decentralized,” you are not alone.
Decentralized companies give more authority to lower-level employees, resulting in a sense of empowerment. Decisions can be made more quickly, and employees often believe that decentralized companies provide greater levels of procedural fairness to employees.
Many companies find that the centralization of operations leads to inefficiencies in decision making.
For example, in the 1980s, the industrial equipment manufacturer Caterpillar suffered the consequences of centralized decision making. At the time, all pricing decisions were made in the corporate headquarters in Peoria, Illinois. This meant that when a sales representative working in Africa wanted to give a discount on a product, they needed to check with headquarters. Headquarters did not always have accurate or timely information about the subsidiary markets to make an effective decision.
As a result, Caterpillar was at a disadvantage against competitors such as the Japanese firm Komatsu. Seeking to overcome this centralization paralysis, Caterpillar underwent several dramatic rounds of reorganization in the 1990s and 2000s. 
However, centralization also has its advantages. Some employees are more comfortable in an organization where their manager confidently gives instructions and makes decisions. Centralization may also lead to
more efficient operations, particularly if the company is operating in a stable environment. 
Hitting the right balance between decentralization and centralization is a challenge for many organizations.
For example, some analysts believe that the Federal Bureau of Investigation (FBI) experiences some problems because all its structure and systems are based on the assumption that crime needs to be investigated after it happens.
Over time, this assumption led to a situation where, instead of following an overarching strategy, each FBI unit is completely decentralized and field agents determine how investigations should be pursued. It has been argued that due to the change in the nature of crimes, the FBI needs to gather accurate
intelligence before a crime is committed; this requires more centralized decision making and strategy development. 
At the Home Depot, the retail giant with over 2,000 stores across the United States, Canada, Mexico, and China, one of the major changes instituted by former CEO Bob Nardelli was to centralize most of its operations.
Before Nardelli’s arrival in 2000, Home Depot store managers made a
number of decisions autonomously and each store had an entrepreneurial culture. Nardelli’s changes initially saved the company a lot of money.
For example, for a company of that size, centralizing purchasing operations led to big cost savings because the company could negotiate important discounts from suppliers. At the same time, many analysts think that the centralization went too far, leading to the loss of the service-oriented culture at the stores. Nardelli was ousted after seven years. 
Formalization is the extent to which an organization’s policies, procedures, job descriptions, and rules are written and explicitly articulated.
Formalized structures are those in which there are many written rules and regulations. These structures control employee behavior using written rules, so that employees have little autonomy to decide on a case-by-case basis.
While formalization reduces ambiguity and provides direction to employees, it is not without disadvantages. A high degree of formalization may actually lead to reduced innovativeness because employees are used to behaving in a certain manner.
In fact, strategic decision making in such organizations often occurs only when there is a crisis. A formalized structure is associated with reduced motivation and job satisfaction as well as a slower pace of decision making. 
An advantage of formalization is that it makes employee behavior more predictable. Whenever a problem at work arises, employees know to turn to a handbook or a procedure guideline. Therefore, employees respond to problems in a similar way across the organization; this leads to consistency of behavior.
Another important element of a company’s structure is the number of levels it has in its hierarchy. Keeping the size of the organization constant, tall structures have several layers of management between frontline employees and the top level, while flat structures consist of only a few layers.
Research indicates that flat organizations provide greater need satisfaction for employees and greater levels of self-actualization.  At the same time, there may be some challenges associated with flat structures.
Research shows that when managers supervise a large number of employees, which is more likely to happen in flat structures, employees experience greater levels of role ambiguity-the confusion that results from being unsure of what is expected of a worker on the job.  This is especially a disadvantage for employees who need closer guidance from their managers.
In tall structures, the number of employees reporting to each manager tends to be smaller, resulting in greater opportunities for managers to supervise and monitor employee activities.
In contrast, flat structures involve a larger number of employees reporting to each manager. In such a structure, managers will be relatively unable to provide close supervision, leading to greater levels of freedom of action for each employee.
Organizational structures differ in terms of departmentalization, which is broadly categorized as either functional or divisional.
Organizations using functional structures group jobs based on similarity in functions. Such structures may have departments such as marketing, manufacturing, finance, accounting, human resources, and information technology.
In these structures, each person serves a specialized role and handles large volumes of transactions. For example, in a functional structure, an employee in the marketing department may serve as an event planner, planning promotional events for all the products of the company.
In organizations using divisional structures, departments represent the unique products, services, customers, or geographic locations the company is serving. Thus each unique product or service the company is producing will have its own department.
Within each department, functions such as marketing, manufacturing, and other roles are replicated. In these structures, employees act like generalists as opposed to specialists. Instead of performing specialized tasks, employees will be in charge of performing many different tasks in the service of the product.
For example, a marketing employee in a company with a divisional structure may be in charge of planning promotions, coordinating relations with advertising agencies, and planning and conducting marketing research, all for the particular product line handled by his or her division.
For example, if the company has multiple product lines, departmentalizing by product may increase innovativeness and reduce response times.
Each of these departments may have dedicated marketing, manufacturing, and customer service employees serving the specific product; yet, the company may also find that centralizing some operations and retaining the functional structure makes sense and is more cost effective for roles such as human resources management and information technology. The same organization may also create geographic departments if it is serving different countries.
In reality, many organizations are structured according to a mixture of functional and divisional forms.
Each type of departmentalization has its advantages:
Functional structures tend to be effective when an organization does not have a large number of products and services requiring special attention.
When a company has a diverse product line, each product will have unique demands, deeming divisional (or product-specific) structures more useful for promptly addressing customer demands and anticipating market changes. Functional structures are more effective in stable environments that are slower to change.
In contrast, organizations using product divisions are more agile and can perform better in turbulent environments. The type of employee who will succeed under each structure is also different.
Research shows that when employees work in product divisions in turbulent environments, because
activities are diverse and complex, their performance depends on their general mental abilities. 
Two Configurations: Mechanistic and Organic Structures
The different elements making up organizational structures in the form of formalization, centralization, number of levels in the hierarchy, and departmentalization often coexist.
As a result, we can talk about two configurations of organizational structures, depending on how these elements are arranged, mechanic structures and organic structures.
In contrast to mechanistic structures, organic structures are flexible and decentralized, with low levels of formalization. In Organizations with an organic structure, communication lines are more fluid and flexible.
Employee job descriptions are broader and employees are asked to perform duties based on the specific needs of the organization at the time as well as their own expertise levels.
Organic structures tend to be related to higher levels of job satisfaction on the part of employees. These structures are conducive
to entrepreneurial behavior and innovativeness. 
Mechanistic structures are those that resemble a bureaucracy. These structures are highly formalized and centralized. Communication tends to follow formal channels and employees are given specific job descriptions delineating their roles and responsibilities.
Mechanistic organizations are often rigid and resist change, making them unsuitable for innovativeness and taking quick action. These forms have the downside of inhibiting entrepreneurial action and discouraging the use of individual initiative on the part of employees. Not only do mechanistic structures have disadvantages for innovativeness, but they also limit individual autonomy and self-determination, which will likely lead to lower levels of intrinsic motivation on the job. 
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