Investment in the promotion of better hygiene for the prevention of di
arrhoeal diseases and as a component of water and sanitation programme
s is increasing. Before designing programmes capable of sustainably mo
difying hygiene behaviour in large populations, valid answers to a num
ber of basic questions concerning the site and the intended beneficiar
ies have to be obtained. Such questions include 'what practices favour
the transmission of enteric pathogens?', 'what advantages will be per
ceived by those who adopt safe practices?' and 'what channels of commu
nication are currently employed by the target population?' A study of
hygiene and diarrhoea in Bobo-Dioulasso, Burkina Faso, used a mixture
of methods to address such questions. This paper draws on that experie
nce to propose a plan of preliminary research using a variety of techn
iques which could be implemented over a period of a few months by plan
ners of hygiene promotion programmes. The techniques discussed include
structured observation, focus group discussions and behavioural trial
s, Modest investment in such systematic formative research with clear
and limited goals is likely to be repaid many times over in the increa
sed effectiveness of hygiene promotion programmes.