Next, you will look at the evidence and the expected outcomes to work out which factors are causing the problem. These are the deterinants of the poroblem. You then work out which factors are changeable and focus there. You would look at ways that people you work with prefer to communicate or receive information (radio, household visits, billboards, etc). You also look at who or what the influencers are for that community, what things help people to accept the suggested changes (called enablers) and what things might discourage people from making change (called disablers).
All this information is incredibly helpful to ensuring you come up with the right activity for positive change.