2.2 The Four Emergency-Dispatch Decision Rules

Why This Is the Most "Learnable" Part of the Entire CritiCall Battery

Unlike the aptitude-driven modules — multitasking speed, memory recall, perceptual character comparison — the Four Decision Rules are literal, fixed, written content that CritiCall publishes in advance in its own candidate preparation guide. The guide is explicit: "You should read and learn these four rules before taking the test. Experience has shown that the better an applicant knows these rules, the better they will perform during the decision-making portions of the test." Nothing else in the CritiCall battery rewards rote memorization this directly — map reading requires spatial reasoning and data entry requires typing skill, but the Four Decision Rules can be memorized word-for-word and scored perfectly by any candidate who studies them.

This also carries an unusual instruction: do not use real-world knowledge. CritiCall's guide states, in a boxed callout: "For purposes of this test you should use only the four decision rules shown below when responding to 'emergency message' items during the test. Do not rely on any prior knowledge about either this agency or any other public-safety agency when responding to those items." A candidate with real 911 experience who answers based on how their local agency actually handles calls — rather than the literal rule as written — can score lower than a candidate with zero dispatch background who has simply memorized the four definitions.

The Four Rules, Verbatim

Two details are easy to overlook and worth calling out directly:

• Fire's "trapped or confined" clause is not limited to structure fires — it applies any time a person needs to be rescued or released, even with no visible flame or smoke.
• Utility explicitly includes streetlights and traffic signals, not just power lines and gas — a malfunctioning traffic signal is a Utility call under this rule, not a Police call, even though a signal outage creates a public-safety hazard.

How You Select an Answer

Each emergency-message item shows four icons on screen labeled Police, Fire, EMS, and Utility. You respond by moving the cursor over the correct icon and left-clicking the mouse once — a single click places a marker (described in the official guide as a "blue dot") next to your choice, and you may change your answer as many times as you like before advancing, as long as you do so within the response window (covered in Section 2.4).

Common Traps

• Multi-symptom messages. A message can describe more than one condition at once (for example, a fire alarm and a person coughing from smoke). The rules are applied to the primary condition described in that specific message — Section 2.3 works through this in detail with original scenarios.
• Confusing property harm with Utility. "Causing harm to another person's property" is explicitly a Police trigger, not Utility — Utility is reserved for public infrastructure systems (water, electric, gas, sewer), not private property damage caused by a person.
• Assuming EMS requires the caller to be the patient. The EMS rule is triggered by the existence of "an emergency medical condition requiring intervention by medically trained personnel" — it does not require the caller to be the one who is sick or hurt; a bystander reporting someone else's medical emergency still triggers EMS.

Why Only One Agency Is Ever Correct Per Item

CritiCall's decision-item format asks for a single click on a single icon — there is no "select all that apply" version of this task, even though real-world 911 calls frequently trigger more than one responding agency in practice (a structure fire with an occupant who needs medical evaluation, for instance, gets both Fire and EMS dispatched by a real communications center). On the test, each item is written so that exactly one of the four rules is the best literal match to the condition described, and your score is based on matching that single intended answer — not on how many agencies a real-world incident might eventually involve. This is the same instruction CritiCall gives about ignoring outside knowledge: the item is a closed logic puzzle against four fixed definitions, not an open-ended dispatch judgment call.

Because the four categories are also mutually exclusive by design, memorizing the rules as a simple decision tree pays off more than memorizing them as four independent paragraphs. A useful ordering to rehearse is: check for a person intentionally harming another person or their property first (Police); then check for fire signs or a trapped/confined person (Fire); then check for a medical condition needing trained intervention (EMS); and only afterward check for a named infrastructure failure (Utility). Working the rules in a fixed sequence, rather than re-reading all four from scratch on every item, is what allows a well-prepared candidate to comfortably beat the 15-second window covered in Section 2.4.