In sociology, primary groups are characterized by close, personal, and emotional bonds, with intense and frequent interactions based on shared interests and a sense of belonging (e.g., family, close friends). Secondary groups are more formal, impersonal, and goal-oriented, with interactions driven by specific objectives (e.g., colleagues, professional associations). The key distinction lies in:
- Intensity of shared interests and association: Primary groups have strong, personal ties and shared values; secondary groups have weaker, task-focused connections.
- Degree of formality and impersonality (2) is also a primary distinguishing factor, as it directly contrasts the informal, personal nature of primary groups with the formal, impersonal nature of secondary groups.
- Size and complexity (1) may vary but are not the defining feature.
- Stability and similarity of background (3) can exist in both but isn’t the core distinction.
Given the emphasis on “intensity of association” and formality in the provided answer, option (2) and option (4) is correct.