The Barrier Analysis study asks people a series of questions aiming to identify which barriers and motivators have the biggest influence on whether they (do not) practice the desired behaviour. The Barrier Analysis study uses the Doer/Non-Doer methodology that consists of interviewing 45 people who already do the behaviour (Doers) and 45 people who have not adopted the behaviour yet (Non-Doers). The differences between their answers are what matters most as they reveal the barriers and motivators to practicing the studied behaviour. The Barrier Analysis has been used by more than twenty relief and development organisations in about 50 countries. It is most useful when used as a part of the Designing for Behaviour Change (DBC) Framework.