Certification Exam: Tasks, Evidence and Tolerances

Why it matters

The certificate is not proof of rules memorized on exam day; it is proof that the same method can be rebuilt on new, independent data. For the Lean Manufacturing Specialist certificate, the activities of every module, the five labs in the academy mode of Yamazo Studio, the capstone project, the theory exam and the practical exam are completed. The theory and practical exams are passed separately; a high result in one does not make up for a shortfall in the other. This lesson explains what these parts ask for, how they are checked and the tolerance rule that decides whether an answer is accepted.

Checking is fully automatic. The server compares the records exported from Studio and the answers entered against the reference; there is no human evaluator. This has two consequences: the same error always gives the same result, and you cannot earn points by writing a justification. Candidates do not film videos; the lab and exam videos are all synthetic videos we produced for training. The result screen shows only the score, not the correct answers. For this reason you need to finish your work by checking your own calculations.

The tolerance rule is the same everywhere: the absolute difference between the answer and the reference must not exceed the larger of the absolute tolerance and the relative tolerance times the reference. For times, the default is ±0.1 s or ±0.5%. At a 10 s reference, 0.5% is only 0.05 s; for this reason the absolute 0.1 s decides. At a 40 s reference, 0.5% comes to 0.2 s, and this time the relative tolerance decides. For percentages, ±0.1 percentage points is accepted; integer decisions such as the number of operators and the number of cards must match exactly. A dataset may state its own tolerance for another unit; if it does, that one applies.

The practical exam deliberately departs from this default. In a video a boundary cannot be marked with the same precision because of the frame interval and image uncertainty. For this reason element boundaries are sought within ±0.30 s of the reference, and element means within ±max(0.50 s; 3%). When the image is uncertain, the reference carries an acceptance range, not a single instant; a single frame is not made the mandatory correct answer. Applying the theory band to the video or the video band to the theory produces errors in two directions: it rejects correct work or accepts wrong work.

Formula