Is a new science in building envelope construction. The science pertains to the connections of exterior claddings and other exterior features (window connections, roof connections, ect.) The theory behind it is "Take care of the little stuff and the big stuff will take care of it's self"
Roofers only know how to connect roofing features and siding guys only know how to connect cladding connections.
Integrationoligy deals with the stuff in between.