Observation is related to Experiment. Experiment is related to Theory. Theory is a type of Explanation. Excuse is a type of Explanation. 
one thing you do when you Type is Create. Create is a type of Appoint. 
Observation <--RelatedTo--> Experiment <--RelatedTo--> Theory --IsA--> Explanation <--IsA-- Excuse 
Type --HasSubevent--> Create --IsA--> Appoint 