This research investigates alcohol consumption in New Zealand to measure the effects of changes brought about by new legislation regulating the sale and supply of alcohol. It follows the same people over time, surveying them not only about their drinking patterns but also issues that may be affected by policy: for example, purchasing patterns: the time of day they buy alcohol, how far they travel, and how much they pay. The research also measures the alcohol environment using available data and key informant interviews to predict how people's behaviour might change. Those who report large changes in their drinking behaviour will be followed up in more depth to explore what policy and non-policy influences have affected their behaviour. This New Zealand study is part of an international collaboration and allows comparisons between different countries. The goal is to inform the development and implementation of effective alcohol policy and reduce alcohol-related harm.