Industrial-Organizational (I-O) psychology is the scientific study of human behavior in the workplace. It applies psychological theories and research methods to improve organizational effectiveness, employee well-being, and productivity. This field encompasses diverse areas such as personnel selection, training, performance appraisal, leadership development, and the design of work environments to optimize both individual performance and organizational health.

Social facilitation is the tendency for people to perform differently when in the presence of others than when alone. Specifically, it often leads to improved performance on simple or well-practiced tasks when others are watching or competing, as seen in Sarah's increased running speed during a race.

Alloparenting is a cooperative breeding strategy observed in various animal species where individuals other than the biological parents assist in the care and protection of the offspring. This behavior increases the survival chances of the young and is a significant topic in evolutionary psychology and behavioral biology, as it demonstrates altruistic tendencies within a social group.

Social facilitation theory suggests that the presence of others enhances performance on simple, well-learned, or physical tasks (like raking or racing). However, for complex cognitive tasks that require deep concentration, such as solving a difficult crossword puzzle, the presence of observers can create anxiety or distraction, which may actually impair performance rather than improve it.

Social loafing is the tendency for individuals to exert less effort when working collectively than when working individually. Latane identified the diffusion of responsibility as the primary cause; when people are in a group, they feel less personally accountable for the outcome, leading them to rely on others to complete the task.

Social facilitation theory suggests that the presence of others increases arousal. This arousal enhances the performance of dominant responses. For simple or well-learned tasks, the dominant response is typically correct, resulting in improved performance. Conversely, for difficult or novel tasks, the dominant response is often incorrect, leading to performance deterioration when others are watching.

Research into communication networks, such as those conducted by Leavitt, indicates that centralized networks like the wheel or Y-shape allow for a clear leader to emerge due to the flow of information. Conversely, decentralized networks like the circle or 'all-channel' (free) structures lack a central node, making it difficult to predict or identify a single dominant leader as information is distributed more equally among members.

Sociology is fundamentally the study of social life, social change, and the social causes and consequences of human behavior. Therefore, the primary unit of analysis is often the group, organization, or social institution rather than the individual. By focusing on groups, sociologists can better understand the collective patterns, norms, and structures that shape human interaction and societal development over time.

Social identity theory posits that individuals derive a significant portion of their self-concept from their membership in social groups. This group membership provides a sense of belonging and social identity, which influences how we perceive ourselves and others. The theory emphasizes that our self-esteem is often tied to the perceived status and value of the groups to which we belong.

Research on workplace violence suggests that risk factors often include a history of aggressive behavior, conflict, or specific personality traits. A female who has recently received increased job responsibilities does not fit the profile of high-risk individuals typically identified in studies of workplace aggression. This option represents a positive professional development scenario rather than a risk factor for violent behavior.