Charity is a type of Virtue. Reliability is a type of Virtue. Reliability is related to Quality. Complexity is a type of Quality. 
Scientist is a type of Researcher. you are likely to find Researcher in/at/on Laboratory. you are likely to find Formula in/at/on Laboratory. Variable is part of Formula. 
Charity --IsA--> Virtue <--IsA-- Reliability <--RelatedTo--> Quality <--IsA-- Complexity 
Scientist --IsA--> Researcher --AtLocation--> Laboratory <--AtLocation-- Formula <--PartOf-- Variable 