Each center has a different theme on various aspects related to olive growing, such as oil production systems and evolution throughout history, qualities of olive oil and uses, olive growing systems, analysis of the olive sector and olive oil marketing system, olive tree biology, olive varieties, by-products of the olive grove and its uses, olive heritage, traditions, types and qualities of olive oils and history of the olive tree and olive oil. The one in Alcalá la Real is dedicated to oil production systems and their evolution throughout history.