Theory of Constraints Certification

The Theory of Constraints Certification is a free intermediate-level, 20-minute skill test from Science of Apps. It tests the Theory of Constraints (TOC), the management philosophy from Eliyahu Goldratt's The Goal — fundamentals (constraints, throughput, inventory and operating expense), the five focusing steps (identify, exploit, subordinate, elevate, repeat), scheduling and logistics (drum-buffer-rope, buffer management and throughput accounting), and the thinking processes and applications (logical trees, evaporating cloud and critical chain project management). Written to TOC body-of-knowledge concepts for 2026. Score 70% or more on its 20 questions to earn a verifiable Theory of Constraints Proficiency certificate (SOA-TCZ). Every question is based on published standards and research — including Eliyahu M. Goldratt and Jeff Cox, The Goal: A Process of Ongoing Improvement (North River Press), Theory of Constraints International Certification Organization (TOCICO) body of knowledge (TOCICO) — and each answer is explained with its source.

Science of Apps offers a free Theory of Constraints Certification, updated for 2026 and 2027. It measures fundamentals, five focusing steps, scheduling and accounting and thinking processes and applications and gives instant results with a shareable certificate.

Read the four skill areas on this page, then take the 20-minute test online — no fee, course or sign-up. You see every answer explained when you finish. Score 70% or more and you get a Theory of Constraints Proficiency certificate straight away, on screen, as a PDF and by email, with a credential ID anyone can verify.

Yes. The questions are original scenarios written by Science of Apps, and each one is based on a public source you can read: Eliyahu M. Goldratt and Jeff Cox, The Goal: A Process of Ongoing Improvement (North River Press); Theory of Constraints International Certification Organization (TOCICO) body of knowledge (TOCICO). The source is shown under each question and linked in the answer review. Science of Apps doesn't copy questions from other tests.

Four skill areas with five questions each, drawn from a bank of 10 per area so a retake brings new questions: Fundamentals (Constraint, Measures and SystemThinking); Five Focusing Steps (Identify, Exploit and Elevate); Scheduling and Accounting (DBR, Buffers and ThroughputAccounting); Thinking Processes and Applications (Trees, Cloud and CCPM). Every question is an original scenario written to the 2026–2027 standard, with the published source named under it.

Operations or production manager, Continuous-improvement or lean practitioner, Project or supply-chain manager, Business or process analyst and TOC student. It suits anyone who wants a quick, verifiable way to show Theory of Constraints knowledge in 2026 and 2027, from students and career switchers to experienced professionals.

The Theory of Constraints (TOC) is a management approach introduced by Eliyahu Goldratt in The Goal. It holds that every system has at least one constraint limiting its performance, and that focusing improvement on that constraint — rather than everywhere at once — is the fastest way to improve the whole system.

They are: identify the constraint, decide how to exploit it (get the most from it), subordinate everything else to that decision, elevate the constraint (add capacity if still needed), and then repeat — going back to step one and not letting inertia become the new constraint.

Yes. The test is online, in English and free everywhere — people take it from India, the US, the UK, Europe, Africa, Latin America and Asia-Pacific. Your certificate is dated with your own local date and can be verified from anywhere at scienceofapps.com/certification/verify/.

20 questions — 5 from each of 4 skill areas — with a 20-minute limit. You need 70% (14 of 20) to pass and 90% for distinction.

We rate it Intermediate: assumes hands-on experience in the role. It has 20 scenario questions — 5 from each of 4 skill areas — and a 20-minute limit. You need 70% (14 of 20) to pass and 90% for distinction.

Nothing. There is no fee to take a test, to receive the certificate, to have it emailed or to verify it, and no sign-up.

On our server, not in your browser. The answers never reach the page until you submit, so a certificate can only be earned by passing. Each certificate gets a unique credential ID stored by Science of Apps.

You see your score for each area and every question with the correct answer and why, with the published source behind it. You can retake after 30 minutes, and the retake draws questions you haven't seen yet.

No. Every certificate is dated, so it always shows when you passed. Retake a test any time for a newer date or a higher score.

Yes. After you pass, Add to LinkedIn opens the Licenses & certifications form with the certificate name, Science of Apps as the issuer, the issue date, your credential ID and the verification link filled in. You can also download it as a PDF or PNG, and it's emailed to you as a PDF.

Every certificate has a credential ID and a QR code. Scanning it, or entering the ID at scienceofapps.com/certification/verify/, shows the holder's name, the certification, the score and the issue date from our records.

No. They are Science of Apps' own assessments of applied skill. They aren't issued by a university or standards body, and they work best alongside a portfolio that shows the skills in real work.