Real is related to Credibility. Credibility is a type of Quality. Quality is related to Rating. 
Captain is a type of Head. Head is related to Rule. Rule is related to Ability. Availability is derived from Ability. 
Real <--RelatedTo--> Credibility --IsA--> Quality <--RelatedTo--> Rating 
Captain --IsA--> Head <--RelatedTo--> Rule <--RelatedTo--> Ability <--DerivedFrom-- Availability 