base on
phrasal verbbase something on/upon something 
- [usually passive] to use an idea, a fact, a situation, etc. as the point from which something can be developed
- What are you basing this theory on?
 - be based on something The maps are based on satellite data.
 - His first novel was loosely based on his own experiences as a doctor.
 - The local economy is largely based on tourism.
 - It was a decision based solely on scientific evidence.
 
Oxford Collocations Dictionaryadverb- closely
 - firmly
 - broadly
 - …