Positivism and post-positivism represent two major philosophical approaches to social research, differing fundamentally in their assumptions about the nature of reality (ontology), knowledge (epistemology), and methodology.

Positivism Originating in the 19th century with Auguste Comte and later refined by Emile Durkheim, positivism is characterized by the following basic postulates:

1. Ontology (Nature of Reality): Positivism assumes an objective reality that exists independently of human consciousness. Social phenomena are seen as 'social facts' that are external to individuals and can be observed and measured objectively, much like natural phenomena.
2. Epistemology (Nature of Knowledge): Knowledge is acquired through empirical observation and sensory experience. The goal is to discover universal, law-like generalizations about social behavior. Researchers aim for objectivity and value-neutrality, separating facts from values.
3. Methodology: Positivists advocate for the application of natural science methods to social research. This includes:
   • Empiricism: Reliance on observable data.
   • Verification: Hypotheses are tested through empirical data, aiming for verification.
   • Quantitative Methods: Preference for quantitative data, statistical analysis, and experimental designs to establish causal relationships.
   • Deductive Reasoning: Moving from general theories to specific hypotheses that are then tested.
   • Search for Laws: The ultimate goal is to identify universal laws that explain and predict social phenomena.

Critiques of Positivism: Critics argue that social reality is too complex and context-dependent to be reduced to universal laws. They also question the possibility of complete objectivity and value-neutrality in social research, given that researchers are part of the social world they study.

Post-Positivism Emerging in the mid-20th century as a response to the limitations of positivism, post-positivism acknowledges the strengths of scientific inquiry but introduces critical modifications:

1. Ontology (Nature of Reality): Post-positivism still believes in an objective reality, but it acknowledges that this reality can only be imperfectly and probabilistically understood. It recognizes that human perceptions and interpretations inevitably mediate our understanding of reality. Reality is not directly accessible but inferred.
2. Epistemology (Nature of Knowledge): Knowledge is not absolute or certain but is always fallible and open to revision. Researchers strive for objectivity but recognize that complete value-neutrality is impossible. The goal is to develop theories that are well-supported by evidence, rather than definitively proven. Knowledge is built through a process of conjecture and refutation.
3. Methodology: Post-positivists retain a commitment to scientific rigor but are more flexible and pragmatic in their methods. This includes:
   • Critical Realism: Acknowledging an underlying reality while recognizing that our observations are theory-laden and fallible.
   • Falsification: Emphasizing Karl Popper's idea that scientific theories can never be proven true, only falsified. Research aims to test and potentially refute hypotheses.
   • Mixed Methods: While still valuing quantitative methods, post-positivists are open to qualitative approaches to gain a deeper understanding of complex social phenomena.
   • Abductive Reasoning: Often combining deductive and inductive approaches.
   • Probabilistic Explanations: Seeking to explain phenomena in terms of probabilities and tendencies, rather than deterministic laws.

In essence, post-positivism represents a more nuanced and humble approach to social science. It maintains the scientific spirit of empirical inquiry and logical reasoning but is more aware of the inherent limitations, complexities, and human elements involved in understanding the social world, moving away from the rigid certainty of classical positivism towards a more critical and reflective empiricism.