The first maps motivation to the conditions that make behavior more likely, called promoting pressures. The second helps us understand the factors (like “AIDS kills” stamps) that make the behavior less likely, called inhibiting pressures. Identifying and consciously influencing the strength of those pressures is the basis of designing for behavior change, codified here as the Intervention Design Process (IDP)—interventions being the things we build to change the pressures and thus the resultant behaviors.
