How the blanks are chosen
This turns usable sentences from your notes into fill-in-the-blank questions by removing the longest meaningful word in each sentence - a simple stand-in for "the key term being tested." It works best on text written as clear, fact-stating sentences (the kind found in textbooks or structured notes) rather than casual prose.
The word chosen as the blank is a mechanical guess at importance (word length, filtered against common filler words), not a judgment about what is actually most important to know - review the generated questions and skip or edit any that picked a less useful blank.
Why word length is used as a stand-in for importance
There's no simple, reliable way for a lightweight tool to judge which word in a sentence is conceptually most important without real language understanding - word length filtered against a list of common filler words is a rough but workable substitute, since longer, less common words tend to be the specific terms being taught more often than short connecting words are.
Why sentences need to be a certain length to be usable
A sentence that's too short often doesn't carry enough context to make a meaningful fill-in-the-blank question, while a very long sentence risks blanking out a word that's only incidental to its main point - the 6-to-30-word range used here is a practical middle ground that favors complete, fact-stating sentences over fragments or run-ons.
Why this works better on textbook-style notes than casual writing
Structured, fact-stating sentences tend to center each sentence around one clear term worth testing, which is exactly the pattern this tool's blank-picking logic is built around - casual prose, with its asides and compound ideas, more often produces a blank on a word that isn't actually the point of the sentence.