iCAST was conceptually influenced by earlier intelligence-led testing frameworks such as CBEST, and follows a broadly analogous structure: defining scope with the AI, gathering and tailoring threat intelligence, conducting a simulated attack informed by that intelligence, and closing out with reporting and remediation planning. It is not phase-less (D), it is a human-led, intelligence-driven exercise rather than an automated scan (A), and it is not compressed into a single unannounced 24-hour window (B) - realistic, patient simulation over a longer period is central to its value, similar to other frameworks in this family.