Surveys can be used especially in relation to the gathering of community demographics where a large number of people may be involved, and also in which multiple variables such socio-economic status, education levels and employment are being measured in relation to the planned intervention. Large scale surveys involving many people can reveal useful information, while smaller surveys may be less generalizable and used only in the context within which they are conducted. Survey design will vary depending on context, such as internet and phone surveys for well resourced communities or face to face surveys for less resourced communities.