What Is NCJOSI?

What Is NCJOSI² (National Criminal Justice Officer Selection Inventory Squared)?

The National Criminal Justice Officer Selection Inventory Squared, almost always shortened to NCJOSI², is a pre-employment screening exam developed by Industrial/Organizational Solutions (IOS) for entry-level law-enforcement candidates. It is IOS's flagship assessment, built to help hiring agencies evaluate both how a candidate thinks and how a candidate is likely to behave on the job before an offer is ever extended.

Unlike a professional license or a credential you renew every few years, NCJOSI² is a selection tool. You take it once during a hiring process, your results go to the agency evaluating you, and there is nothing to "maintain" afterward. That single fact changes how you should prepare for it - the goal isn't ongoing competency, it's a strong, accurate performance on one specific test day. If you want a deeper dive into what the credential is and isn't, our companion piece on what NCJOSI actually is and our breakdown of the NCJOSI meaning both cover this distinction in more detail.

Who Uses the NCJOSI² and Why

Law enforcement agencies bring in IOS assessments because hiring the wrong candidate for a badge-carrying position is expensive and risky in ways that go far beyond a bad performance review. Agencies want a data point on cognitive processing under pressure and a separate data point on integrity-related tendencies, and NCJOSI² is designed to deliver both in a single sitting.

If you're applying to an agency and see NCJOSI² named in the job posting or testing notice, it typically means you'll sit for a combined cognitive-and-integrity exam rather than a purely academic knowledge test. That's a meaningfully different animal than a civil-service style test bank of memorized facts, and it's why generic test prep often falls short. For a full walkthrough of what candidates are legally and practically expected to bring to the table before testing, see our guide to NCJOSI requirements.

Exam Format: Forms, Timing, and Question Types

NCJOSI² is published in two parallel forms - Form 1 and Form 2 - so that different testing sessions or retests can use equivalent but non-identical versions. Both forms follow the same structure:

• Cognitive Ability Measure: 80 multiple-choice items.
• Non-cognitive (Integrity) Measure: 120 statements rated on a five-point agreement scale.
• Total testing time: 2 hours 30 minutes, plus an additional 15 minutes allotted for instructions.

That's 200 total items combining hard reasoning questions with self-report statements about work habits and attitudes. The two sections feel very different to sit through - the cognitive portion demands sustained, active problem-solving, while the integrity portion asks you to respond honestly and consistently to statements about how you typically behave. Pacing yourself across both sections matters, and we cover section-by-section timing strategy in the NCJOSI Study Guide 2026.

The 14 NCJOSI² Domains Explained

The 80-item Cognitive Ability Measure and the 120-item Non-cognitive Measure together draw from 14 distinct domains. Knowing these by name - and understanding what each one actually tests - is the single biggest advantage a candidate can have going in. A full breakdown of every domain, with sample reasoning patterns, lives in our NCJOSI Exam Domains 2026 guide, but here's the landscape:

Notice how different these two groups are in nature. Domains 1-10 have objectively correct answers you can practice toward. Domains 11-14 don't have a "correct" answer in the same sense - they're measuring patterns in how you describe yourself, so the smartest preparation is understanding the constructs, not trying to game the scale.

NCJOSI² vs. the Original NCJOSI

IOS also publishes an earlier, shorter assessment simply called NCJOSI (without the "squared"). Some agencies still use this original version, so it's worth knowing the difference if you're not sure which one your department administers.

If your hiring notice just says "NCJOSI" without the exponent, double-check with the agency's HR or testing coordinator which version you'll actually sit for - the item counts and time allotted are meaningfully different, and preparing for the wrong length exam can throw off your pacing on test day.

IOS Remote Testing: What Candidates Should Know

Some agencies administer NCJOSI² through IOS Remote Testing rather than an in-person testing center. If your agency uses this option, a few logistical details matter:

• Remote candidate portals may schedule additional time beyond the exam itself for check-in and technical support.
• You'll need two separate devices to test remotely - this is a hard requirement, not a suggestion.
• Both devices must run IOS-specified secure-browser software.
• A live proctor monitors the session through the required software, so testing from a noisy or shared space can create problems.

Because remote testing conditions and scheduling windows vary by agency, it's worth reviewing our dedicated post on NCJOSI Exam Dates 2026 before you lock in a testing slot.

Building a Study Plan Around the Domains

Because NCJOSI² blends objective reasoning domains with self-report integrity domains, an effective prep plan treats them differently instead of grinding through generic "test prep" drills. A simple way to structure the weeks leading up to your test date:

This structure front-loads the domains that respond best to repeated practice (reasoning and verbal skills), saves the perceptual domains for when your stamina is built up, and reserves the integrity section for last since it rewards self-awareness rather than drilling. For a more detailed, day-by-day version of this approach, see the NCJOSI Study Guide 2026. If you want to gauge realistically how demanding the exam feels once you're inside a timed session, our How Hard Is the NCJOSI Exam? guide walks through that in detail, and you can start running full-length practice sessions any time at our NCJOSI practice test platform.

Cost, Scoring, and Where to Go Next

Because NCJOSI² is administered by individual hiring agencies rather than sold directly to the public, fee structures, scheduling windows, and scoring thresholds vary by department. Rather than guess at numbers that change by jurisdiction, check the specifics for your agency and cross-reference them against our dedicated breakdowns: NCJOSI Certification Cost 2026 for pricing mechanics, NCJOSI Passing Score 2026 for what "passing" actually means on this exam, and NCJOSI Pass Rate 2026 for what the available data shows. If you're still deciding whether pursuing an agency that requires NCJOSI² is the right career move, our ROI analysis and salary guide both dig into that question from a career-planning angle. You can also browse practice material and full simulations directly on the main practice test site to get a feel for the actual item styles before test day.

Frequently Asked Questions