This research examined, via a multi-method linked design, the influences over police decision making when disorderly behaviour is being dealt with in the context of a new type of offence disposal, the penalty notice for disorder (PND). The results of a multivariate analysis of the factors predicting the real-life issuance of PNDs to offenders formed the basis of an experiment (using serving police officers as participants) that probed officers' decision-making processes in disorder scenarios. This approach presents an opportunity to gain insight into how police use the power of arrest when an alternate, less-punitive, option is available.Keywords Police discretion . Disorder . Arrest . Fixed penalty notices . Police decision making . Mixed methods design Following a growing political agenda to restore public confidence in law enforcement by tackling low-level offending or 'signal crimes' that fuel public fear (Innes and Fielding 2002;Kelling and Coles 1996;Wilson and Kelling 1982), research into policing disorder has become particularly energised within the UK. However, the extent to which police officers are themselves influenced by such signal crimes remains unclear, and the lack of consensus on a precise definition further obfuscates the issue. For example, the British Crime Survey (BCS) categorises a range of disorder offences (including vandalism, car abandonment, littering, being noisy neighbours, being drunk in public and rowdy behaviour) as antisocial behaviour. The 2006/2007 BCS sweeps show that 18% of respondents