"Our project will thus use fun to promote this intervention." -- I like that idea!
I'm a computer science professor from a developing country, where I'm also involved in a few small ministries that directly or indirectly involve kids in low-income communities. I could form student groups to develop mobile games to motivate kids in low-income communities to wash their hands. If the target beneficiaries are kids aged 1-5, then instead of playing the games themselves, they could "play" the games "vicariously" through an adult, who could project the game on a screen, or simply act out the game, while she is playing it "on behalf of the kids." Playing the game on behalf of the kids means that it's the kids who will tell her what specific moves to make in the game. The game could have a graphical user interface, or could simply be text- (and sound-)based. (Of course the assumption here is that there are Tippy Tap-like stations that are available in or outside the play area. ) What do you think of this way of "using fun to promote [the] intervention"?