Left Realists argue that crime is caused by several different factors. They call this multiple aetiology. Crime is a product of formal and informal rules, actions of offenders and of reaction by victims, the state and its agencies, it is therefore important to understand why people offend, what makes victims vulnerable, the factors that affect public attitudes and responses to crime and the social forces that influence the police. This can be done by drawing together different agencies in the community, who all work together to solve crime.