Term Kind Topic What it is
Debt Interest Rate Cost Per Unit Time, Debt Triage Axis concept Technical Debt How much a piece of technical debt costs per unit time in slowed delivery, incidents and effort - which, paired with the cost to fix, is what separates debt worth paying down from debt that merely looks unpleasant.
Technical Debt Quadrants concept Technical Debt Distinguishing debt by whether it was taken deliberately or inadvertently, and prudently or recklessly, since the four kinds need different responses.