"’Yes, and...’, also referred to as ‘Yes, and...’ thinking, is a rule-of-thumb in improvisational comedy that suggests that a participant should accept what another participant has stated ("yes") and then expand on that line of thinking ("and"). It is also used in business and other organizations as a principle that improves the effectiveness of the brainstorming process, fosters effective communication, and encourages the free sharing of ideas.”

https://en.wikipedia.org/wiki/Yes,_and...