Status: OUT
SOLID is the single unifying thread of OO design: its dual function as both theoretical ground (enabling the composition paradigm that makes variation management systematic via LSP→DIP→OCP) and conceptual map (guiding expert judgment through structural isomorphism to pattern mastery) means SOLID simultaneously defines what OO design IS — systematic variation management — and HOW to practice it — principled pattern selection.
SOLID's map/ground duality unifies the ontology (variation management) with the epistemology (expert judgment) of OO design
Depends on (SL): solid-dual-function-map-and-ground, design-as-systematic-variation-management