Teaching Case — What "I Could Not Check That" Looks Like

The most important template here, and nothing in it is badly written: it is an ordinary plan in its first week, with one task nobody has estimated yet. Everything downstream of that task therefore has NO DATE. Rather than drawing bars anyway, the engine leaves those rows blank, says which task caused it, and reports the plan as not verified. That state — checked, and could not decide — is the one most tools never show anyone.