Mechanism can be used for Perform. Barrier is a type of Mechanism. Barrier is a type of Obstacle. 
Pro is a synonym of Advantage. Advantage is related to Hand. you are likely to find Spoon in/at/on Hand. Spoon is a type of Container. 
Perform <--UsedFor-- Mechanism <--IsA-- Barrier --IsA--> Obstacle 
Pro <--Synonym--> Advantage <--RelatedTo--> Hand <--AtLocation-- Spoon --IsA--> Container 