Effect is a type of Validity. Validity is related to Reliability. Reliability is related to Quality. Ease is a type of Quality. 
Exploration is related to Finding. Finding is related to Difference. 
Effect --IsA--> Validity <--RelatedTo--> Reliability <--RelatedTo--> Quality <--IsA-- Ease 
Exploration <--RelatedTo--> Finding <--RelatedTo--> Difference 