Los Angeles for As noted previously, stating an intention to act does not inevitably imply that a person will act. Perceived susceptibility beliefs are considered necessary here to motivate progression to action. Moving from stage to stage relates to moving from motivation to volition. n Stage the action stage, when a person has initiated what is necessary to reduce their risk. n Stage this final stage is not always required. This stage is about maintenance and unlike with smoking cessation, some health behaviour processess are not long-lasting, for example deciding whether or not to have a vaccination or a mammogram. Weinstein has applied the PAPM to studies of home testing for radon, an invisible odourless radioactive gas produced by the decay of naturally occurring uranium in soil in some geographical areas. Los Angeles 2016.