Personality refers to the relatively stable patterns of thoughts, emotions, and behaviours that distinguish one individual from another. It develops through a complex interaction of multiple determinants and plays a crucial role in shaping how individuals behave in social and organisational settings. Understanding the determinants of personality and its influence on organisational behaviour is essential for analysing employee motivation, performance, and workplace dynamics. Along with personality, perception and attribution processes strongly affect how employees interpret situations, respond to others, and evaluate their own and others’ performance within organisations. The major determinants of personality can be broadly classified into biological, psychological, social, and cultural factors. Biological determinants include heredity, brain structure, and physiological processes. Genetic inheritance provides the basic framework for personality by influencing traits such as temperament, emotional stability, and energy levels. For example, some individuals are naturally more introverted or extroverted due to inherited characteristics. Hormonal balance and nervous system functioning also affect emotional responses, stress tolerance, and aggression, which later shape personality development. Although heredity does not determine personality completely, it provides the raw material upon which other factors act. Psychological determinants include intelligence, motivation, learning, attitudes, values, and emotional experiences. Intelligence influences problem-solving ability, adaptability, and learning capacity, which contribute to confidence and self-concept. Motivation shapes goal orientation, persistence, and achievement behaviour, forming important personality characteristics such as ambition or complacency. Learning through life experiences modifies behaviour patterns and responses, gradually stabilising