Assume Breach, Assumed Breach or Assumed Compromise — is it the same thing?

“The terms describe the same premise: that the attacker is already inside. Assume Breach is the most common name; Assumed Breach and Assumed Compromise are used interchangeably. With us it is the same engagement either way — we start from one compromised standard account and measure how far an attacker gets, and what your defences catch along the way.”