Surveys, the means by which policy makers and donors collect data on the effectiveness of interventions as well as the priorities of citizens, tend to be costly and time-consuming.
Tafiti, ni njia ambazo watunga sera na wahisani hutumia kukusanya taarifa kuhusu ufanisi wa utendaji wao na pia vipaumbele vya wananchi, mara nyingi huwa zina gharama kubwa na zinazochukua muda mwingi.