Organizational behavior (OB) is "the study of human behavior in organizational settings, the interface between human behavior and the organization, and the organization itself." (p.4)  OB can be divided into three levels: the study of (a) individuals in organizations (micro-level), (b) work groups (meso-level), and (c) how organizations behave (macro-level).
The Hawthorne studies stimulated OB researchers to study the impact of psychological factors on organizations. In his 1931 book, Human Problems of an Industrial Civilization, Elton Mayo advised managers to deal with emotional needs of employees. The human relations movement, an outgrowth of the Hawthorne studies, influenced OB researchers to focus on teams, motivation, and the actualization of individuals' goals within organizations.
Starting in the 1980s, cultural explanations of organizations and organizational change became areas of study. Informed by anthropology and sociology, qualitative research became more acceptable in OB.
Current state of the field
Research in and the teaching of OB can be found in university management departments as well as psychology departments and business schools. In the UK particularly, OB graduate training is part of the requirements to become an occupational psychologist. 
During the last 20 years, there have been additional developments in OB research and practice:
Anthropology has become increasingly influential, and led to the idea that one can understand firms as communities, by introducing concepts such as organizational culture, organizational rituals, and symbolic acts.
Computer simulation is a prominent method in organizational behavior. While there are many uses for computer simulation, most OB researchers have used computer simulation to understand how organizations or firms operate. More recently, however, researchers have also started to apply computer simulation to understand individual behavior at a micro-level, focusing on individual and interpersonal cognition and behavior such as the thought processses and behaviors that make up teamwork.
Qualitative research consists of a number of methods of inquiry that generally do not involve the quantification of variables. Qualitative methods can range from the content analysis of interviews or written material to written narratives of observations. Some common methods include:
Although definitions of workplace bullying vary, it involves a repeated pattern of harmful behaviors directed towards an individual. In order for a behavior to be termed bullying, the individual or individuals doing the harm have to have either singly or jointly more power than the victim.
There have been a number of approaches and theories that concern leadership. Early theories focused on characteristics of leaders, while later theories focused on leader behavior, and conditions under which individuals can be effective. Some leadership approaches and theories include:
Ohio State Leadership Studies identified the dimensions of consideration (showing concern and respect for subordinates) and initiating structure (assigning tasks and setting performance goals).
Path-goal theory is a contingency theory linking appropriate leader style to organizational conditions, and subordinate personality.
In the late 1960s Henry Mintzberg, a graduate student at MIT, carefully studied the activities of five executives. On the basis of his observations, Mintzberg arrived at three categories that subsume managerial roles: interpersonal roles; decisional roles; and informational roles.
National culture is thought to affect the behavior of individuals in organizations. This idea is exemplified by Hofstede's cultural dimensions theory. Hofstede surveyed a large number of cultures and identified six dimensions of national cultures that influence the behavior of individuals in organizations.
Organizational culture emphasizes the culture of the organization itself. This approach presumes that organizations can be characterized by cultural dimensions such as beliefs, values, rituals, symbols, and so forth. Within this approach, the approaches generally consist of either developing models for understanding organizational culture or developing typologies of organizational culture. Edgar Schein developed a model for understanding organizational culture and identified three levels of organizational culture:
Artifacts and Behaviors
Shared Basic Assumptions
Schein argued that if any of these three levels were divergent tension would result: if, for example, espoused values or desired behaviors were not consistent with the basic assumptions of an organisation it is likely that these values or behaviors would be rejected.
Typologies of organizational culture identified specific organisational culture and related these cultures to performance or effectiveness of the organization.
Personality concerns consistent patterns of behavior, cognition, and emotion in individuals. The study of personality in organizations has generally focused on the relation of specific traits to employee performance. There has been a particular focus on the Big Five personality traits, which refers to five overarching personality traits.
There are number of ways to characterize occupational stress. One way of characterizing it is to term it an imbalance between job demands (aspects of the job that require mental or physical effort) and resources that help manage the demands.
Chester Barnard recognized that individuals behave differently when acting in their work role than when acting in roles outside their work role. Work-family conflict occurs when the demands of family and work roles are incompatible, and the demands of at least one role interfere with the discharge of the demands of the other.
Relation to organizational psychology
According to Miner (2006), OB and organizational psychology somewhat overlap. Although there are differences between the two disciplines, there remains some confusion regarding the nature of the differences between OB and organizational psychology.
Organization theory is concerned with explaining the organization as a whole or populations of organizations. The focus of organizational theory is to understand the structure and processes of organizations and how organizations interact with industries and societies. Within business schools, organization theory or OT is considered a separate specialization in management from OB.
Max Weber argued that bureaucracy involved the application of rational-legal authority to the organization of work, making bureaucracy the most technically efficient form of organization.Charles Perrow extended Weber's work, arguing that all organizations can be understood in terms of bureaucracy and that organizational failures are more often a result of insufficient application of bureaucratic principles.
Weber's principles of bureaucratic organization:
A formal organizational hierarchy
Management by rules
Organization by functional specialty and selecting people based on their skills and technical qualifications
An "up-focused" (to organization's board or shareholders) or "in-focused" (to the organization itself) mission
Purposefully impersonal, applying the same rules and structures to all members of the organization
Organizational ecology models apply concepts from evolutionary theory to the study of populations of organisations, focusing on birth (founding), growth and change, and death (firm mortality). In this view, organizations are 'selected' based on their fit with their operating environment.
The systems framework is also fundamental to organizational theory. Organizations are complex, goal-oriented entities.Alexander Bogdanov, an early thinker in the field, developed his tectology, a theory widely considered a precursor of Bertalanffy's general systems theory. One of the aims of general systems theory was to model human organizations. Kurt Lewin, a social psychologist, was influential in developing a systems perspective with regard to organizations. He coined the term "systems of ideology," partly based on his frustration with behaviorist psychology, which he believed to be an obstacle to sustainable work in psychology (see Ash 1992: 198-207). Niklas Luhmann, a sociologist, developed a sociological systems theory.
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