What Is A CML?

The Short Answer: A CML Is a Master-Level Logistics Professional

A CML is a Certified Master Logistician: a logistics professional who has earned the master-level designation from SOLE, The International Society of Logistics. The credential is aimed at people who have spent years in the field, not newcomers looking for an entry-level badge. It signals broad, experience-backed command of logistics as an engineering and management discipline, spanning how systems are designed and sustained as well as how goods and services reach customers.

If you have searched for the term and landed on a mix of unrelated results, note that the acronym is shared by several unrelated credentials. This article is strictly about the logistics designation. For parallel explainers on the same topic, see our pieces on what CML certification is and what CML stands for.

Who Issues the Credential

The CML is the official designation of SOLE, The International Society of Logistics. Indexed program text identifies the CPL Qualification Review Board and SOLE-appointed proctors as the bodies involved in qualification review and exam administration. No external commercial testing vendor has been verified for this credential, which is a meaningful difference from the many certifications you book through a national network of test centers.

In practical terms, that means the process is closer to a professional-society model than a click-and-schedule vendor model. Your application is reviewed by the society's qualification structure, and exam sessions are overseen by proctors the society appoints. If you are used to booking a seat online with a third-party testing company, adjust your expectations: confirm the current process directly with SOLE before planning anything around a specific date or location.

How the Exam Is Built

The published exam format is six hours total, divided into three two-hour parts. The historical record is the clearest guide to the question style: a June 2012 indexed guide describes three parts of 100 multiple-choice questions each, which adds up to a historical 300 questions. The official materials inventory also lists a Part III case-study companion, which suggests the third part may not be a pure multiple-choice block.

Here is where candor matters. The current exact question count, the split between scored and unscored items, and the response format for each part are unverified. Do not assume the exam is still 300 multiple-choice questions, and do not assume it is not. The three-part, six-hour structure is the firmer anchor; the item-level details should be confirmed with SOLE.

For the passing-score question specifically, see our dedicated breakdown at CML passing score, which lays out what is and is not publicly known.

What the Exam Covers

The three historical part labels map to three content areas. No official percentage weights have been established, so there is no verified "largest domain," and you should not treat the three areas as equally weighted by assumption either. The safest posture is to prepare for all three as substantial. For a fuller domain-by-domain walkthrough, read our complete guide to the three CML content areas.

Experience Requirements Before You Sit

Indexed eligibility language calls for eight years of practicing or teaching logistics, including two years in each of at least two fields. That second clause is easy to overlook and is where many strong candidates stumble: the credential is designed to reward breadth. Eight years in a single narrow function is not the same profile as eight years that span, for example, distribution work and systems-level planning.

Several details remain unverified: whether degree substitutions apply today, whether training hours count toward the experience total, and what reference requirements the application imposes. The official inventory identifies a June 2022 application and instructions document, which is the most recent application material located, but it is not a confirmed 2026 requirements sheet. Our CML requirements guide walks through how to document your experience and what to verify with SOLE before you apply.

Fees, Scheduling, and What Is Still Unverified

The official indexed fee is $125 for members and $275 for nonmembers. Treat that as a reference point, not a guaranteed current price: it has not been confirmed as a September 2026 transaction price, and retake fees are unknown. If you are weighing membership, the gap between the two figures is worth factoring in, since joining the society may change your total outlay. For a fuller picture of what to budget, see our CML certification cost breakdown.

On scheduling, a May and November testing schedule has historically been published. Current dates, along with the rules on open-book use, calculators, remote delivery, and adaptive testing, are unverified. That list is exactly the kind of detail that changes how you prepare, so confirm it before committing to a study plan. Our page on CML exam dates tracks the scheduling picture as it becomes clearer.

Keeping the Designation Active

Federal occupational resources such as My Next Move and O*NET describe a five-year renewal cycle built on continuing education and professional development, with no re-examination. That is a favorable model for working professionals: you maintain the credential by staying current in the field rather than retaking a six-hour exam. What is not verified is SOLE's current unit totals, renewal fees, and the full text of the renewal policy, so read the official policy before you rely on specifics.

Where a CML Fits in the Logistics Job Market

The CML is most relevant in roles where logistics is treated as a system to be engineered and managed, not merely an operation to be run. That includes logistics management, supply chain leadership, support and sustainment functions, and teaching or advisory roles, which fits the eligibility language that explicitly counts teaching. Employers who value it tend to be those with complex, long-lifecycle products or large distribution networks, where integrated thinking has real payoff.

Be realistic about the hiring signal: this is a respected, specialized designation, but it is not as universally recognized in job postings as some larger credentials. Its value often shows up in senior-level credibility and in how it differentiates you among experienced peers. Explore the market side in our guides to CML jobs and the CML salary guide, and weigh the investment honestly using our analysis of whether the CML is worth it. We do not quote specific salary or pass-rate figures here because no verified numbers are publicly available; see what the data shows on CML pass rates for the current state of the evidence.

Sequencing Your Preparation Around the Three Parts

You do not need an elaborate method here. The goal is simply to order your effort around how the exam is built. Because the six-hour format is three two-hour blocks, build stamina deliberately, and because the third part is application-heavy, do not leave it for the last minute. Our CML study guide goes deeper on resources and technique.

Systems Management goes first because it supplies the framework that the other two areas reuse. The case study comes last because it forces you to combine everything. When you are ready to test yourself against exam-style questions, our CML practice tests are a good place to find gaps, and the CML cheat sheet helps with last-pass review. If you are still sizing up the commitment, read how hard the CML exam is.

Frequently Asked Questions