Definition: Quota sample
OECD - Business tendency surveys
A method of sampling in which the sampling units are selected according to a number of controls designed to ensure that the units sampled are broadly representative of the target population. In the case of a consumer opinion survey the controls might refer to age, sex, income group and education level. In the case of a business tendency survey the controls might refer to size, location, and kind of activity.
Organization for Economic Cooperation and Development (OECD), "Business Tendency Surveys - A Handbook", OECD, Paris, 2003)