Problem gambling is becoming an increasing issue throughout the world with greater numbers of people presenting to treatment services with gambling problems. However, many cases are still missed, due in part, to a lack of general screening tools that are able to be used by non-specialist gambling services. This paper presents the findings of a gambling screening tool (Gambling Impact Scale - GIS) which was designed to identify problem gambling behavior, associated psychopathology and impact to self and others. The principle aim was to devise a tool that could be used by all potential treatment agencies that may come into contact with people experiencing problems with their gambling. The Gambling Impact Scale (GIS) consists of three sub-scales. Both internal and concurrent validity of the tool have been established with a help seeking gambling population. Discussed are further refinements of the GIS in general mental health and counseling populations.