Remember ARO
Full name: Annualized Rate of Occurrence
Memory aid: Annual Rate counts Occurrences.
A rate can be fractional when an event is expected less than once a year.
Study area: MIS, risk & continuity · Batch 3
Relevant study for: CompTIA Security+ SY0-701 · ISC2 CISSP 2024 outline · CompTIA SecurityX · ISC2 CC
Practice with exam flashcards →MIS, Risk & Continuity / Knowledge library
ARO — Annualized Rate of Occurrence
Estimates how often an event occurs per year.
Why learn ARO — Annualized Rate of Occurrence?
Estimates how often an event occurs per year.
Where it came from
A rate can be fractional when an event is expected less than once a year.
- Memory aid (a learning cue, not the expansion): Annual Rate counts Occurrences.
Build your understanding
Work through these exercises in order. Try the task before opening a reference.
- Without looking, expand ARO: Annualized Rate of Occurrence.
- Recall this memory aid: Annual Rate counts Occurrences.
- Explain the practical use: Estimates how often an event occurs per year.
- Explain this distinction: A rate can be fractional when an event is expected less than once a year.
- Identify ARO in a device specification, architecture diagram, or system inventory.
Documentation and sources
- NIST cybersecurity glossary (csrc.nist.gov)