Yes And is a technique that is taught in improvisational acting and in communications courses.
In improv, an actor begins supplying some bit of information that helps to create the scene. They may say to another actor “Looks like we’re in for a bad storm.” This is called an offer and the other actor’s job is to accept the offer and support their scene partner. They might say “Yes and I hope that the road doesn’t flood.” The opposite of accepting the offer is blocking, for example, contradicting the offer, which stops the flow of the scene.
Here is a video that demonstrate this technique:
Yes And as a communication technique is meant to raise awareness of when we are dismissive of the ideas of other people. For example, Chris says “We could hire a virtual assistant to handle all the routine work that is using up all of our time.” Lee says “Yes but we’d have to spend time training a VA in how we want things done.”
The “but” in that reply can feel like a rejection of the original idea. Can’t you just hear Chris say “You’re always so negative. How are we ever going to get out from under if we don’t do anything?”
If Lee said “Yes and we’d have to spend time training a VA in how we want things done.” The conversation might continue in a similar vein. “Yes and we could start the VA in stages to break up the time drain.” Or even “Yes and we’d want to think of a way to minimize the disruption.”
Use the “Yes And” method to acknowledge and accept another’s suggestion and build on it.