An interviewer-assisted cross-sectional survey was conducted in a developed typical residential heartland located in the west of Singapore, from early-June 2013 to early-August 2013. The short duration of this cross-sectional study is to minimise any bias that might have been introduced over a longer duration of the study. For example, the longer the interviewers were present around the neighbourhood, the more likely it may arouse interest among the residents on this study that may indirectly influence their choices during the surveys. In addition, the short duration is an optimal strategy to avoid any form of public campaign or events that may be held which the study team may not be aware of and may indirectly influence the results of this study. This area is one of the furthest residential areas situated away from the central business district (about 18 km) that can truly represent a residential heartland environment in Singapore [11], [18]. In total, the three largest zones (Zone A, B, C), which cover about 6000 residential units, were been selected for the survey. Four Housing Development Board (HDB) blocks from each zone were selected by simple random sampling technique using lottery method from the list of HDB blocks found in each zone. All the units in these blocks were invited to participate in the survey from door-to-door. The questionnaire was designed to tackle the behaviour of the participants first before we questioned them on their knowledge and attitude towards handwashing. This is to ensure that the participants’ responses on their hygienic behaviour would not be biased by the questions on knowledge and attitude.