The primary research tools of quantitative criminology can be used to investigate numerous causes of crime. Obtaining useful data is beneficial to society in a variety of ways. Criminal behaviour and social responses to criminal behaviour are studied using quantitative data. Crime research has traditionally relied heavily on quantitative data, even if other sorts of data have been employed to make significant contributions to criminological thought. For CCJ researchers, this document explains the many forms of quantitative data they are likely to encounter. Measurement and analysis of data obtained through polls or questionnaires as well as manipulation of pre-existing data using computer techniques are at the heart of quantitative methods. A robust foundation of descriptive data is necessary for sound quantitative criminology. In the field of criminology, descriptive inference proves to be particularly difficult. The nature of criminal behaviour necessitates a reliance on official records, but this might lead to erroneous judgments. However difficult it may be, researchers and politicians alike are still working to better understand how interventions, legislation, and personal experiences affect criminal behaviours.