In the late 1990s, as digital practices like web design and development emerged, experiences were being created and users were getting attention, but the practices that guided that work had not yet been articulated.

That's when Jesse James Garrett wrote his book, The Elements of User Experience. After sharing his ideas in numerous client pitches and sketching them on whiteboards for his co-workers, Jesse collected his discoveries into a manuscript that would become the first textbook for the new field of UX design.

https://ellessmedia.com/csi/jesse-james-garrett/