ELCA is a longitudinal survey that follows approximately 10,800 Colombian households in rural and urban areas every three years. Its aim is to follow the same households for 12 years. The main objective of the survey is to understand better the social and economic changes that the households and their members experienced. For this reason, ELCA provides information regarding household behaviour and its effects on their well-being. It also collected data on anthropomorphic measurements and verbal skill tests to children who were under 10 years old in 2010. Initial sample size: 10,800 households consisting of 6,000 urban households and 4,800 rural households. Estimated current sample size (2016): 8,818 households, 4,394 urban households + 4,424 rural households.