Productivity is a type of Ratio. Productivity is derived from Produce. Elaborate is a type of Produce. Elaborate is a type of Develop. 
Source is related to Foundation. Foundation is the opposite of Roof. Roof is related to Cover. Concrete is a type of Cover. 
Ratio <--IsA-- Productivity --DerivedFrom--> Produce <--IsA-- Elaborate --IsA--> Develop 
Source <--RelatedTo--> Foundation <--Antonym--> Roof <--RelatedTo--> Cover <--IsA-- Concrete 