a reference system that determines this complex process, ensuring its accuracy and effectiveness in identifying the nature of the child’s neuropsychological development. This diagnosis is based, first of all, on the principle of complexity, which implies the study of all aspects of neuropsychological functioning, including cognitive, sensory, motor, emotional and socio-psychological functions, in order to form a comprehensive picture of the child’s condition, and not just one aspect. It is also based on the principle of individuality, which takes into account the natural differences between children in age, abilities, experiences and personality traits, as each child has a unique developmental trajectory. It is also based on the principle of dynamism and evolution, according to which diagnosis is seen as a continuous process that tracks changes in the child’s functions over time, rather than as a fixed, one-time assessment. Another fundamental principle is the relationship between function and environment, which emphasizes the need to understand neurological abilities and behaviors in the context of the environment and social interaction, that is, how the child uses his or her potential in everyday life and in interaction with other people. Finally, diagnosis is based on scientific objectivity, which requires the use of standardized and reliable instruments and tests, as well as adherence to rigorous scientific standards to ensure the integrity and validity of the results. These principles form the fundamental basis that makes paediatric neuropsychological diagnosis an accurate means of understanding development and identifying therapeutic and educational interventions.