Commitment is a type of Cooperation. Commitment is a type of Engagement. Engagement is related to Propose. 
Slope is related to Form. Dish is a type of Form. Dish is related to Food. 
Cooperation <--IsA-- Commitment --IsA--> Engagement <--RelatedTo--> Propose 
Slope <--RelatedTo--> Form <--IsA-- Dish <--RelatedTo--> Food 