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CISM study material · question 97 of 1000

A programme treats its life cycle as strictly one-directional, refusing to revisit earlier phases. What does NIST say about this?

  1. The life cycle is strictly linear, so revisiting a phase indicates that the earlier work was planned or executed badly
  2. Knowledge gained later, or changes in requirements or environment, may require revisiting an earlier phase
  3. A completed phase may be reopened only by the authorising official, and only as part of a reauthorisation of the system
  4. Revisiting an earlier phase invalidates the system's authorisation
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Answer: B. Knowledge gained later, or changes in requirements or environment, may require revisiting an earlier phase

NIST notes that while the life cycle is expressed as a linear flow, knowledge gained during a later phase, or changes in requirements or operational environments, may dictate revisiting an earlier phase.

Source: NIST SP 800-39 (NIST) — Sec. 2.5 footnote 45

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