Every teacher knows the moment: you ask for a volunteer, get the same three hands, and the quiet students in the back sink a little lower. Random pickers fix the participation problem — but they introduce a trust problem. Students have grown up with wheels they suspect are rigged, and honestly, some of them were. This guide is about running draws your class will actually believe.
01 Rotate, do not repeat
The worst classroom picker failure is picking the same student twice in a row. Use daily mode: every student is drawn exactly once per day, and the list resets overnight automatically. For longer units, weekly mode guarantees a full rotation across the week. Both are built into the name picker and require zero bookkeeping from you.
02 Pre-commit with a PIN lock
Suspicion peaks when a teacher prepares a draw privately. The PIN lock removes the temptation entirely: set up the draw, lock it with a PIN, and the result is frozen. In class, enter the PIN to reveal. Nobody — including you — can re-roll between preparation and reveal without it being obvious, because the seed is fixed the moment you lock.
03 Set the seating constraints once
In the group generator, mark keep-apart pairs for students who should never share a group — the tool treats these as hard rules and will tell you if your rules can't all be satisfied, rather than quietly breaking one. Mark keep-together pairs for co-dependent pairs you want to stay together. Set this once at term start and every weekly reshuffle respects it automatically.
04 Keep the receipt for disputes
When a student claims "you always pick me", the answer is a receipt, not an argument. Every draw produces a one-line receipt with its seed; paste it in your planning doc. The draw for October 14th is provably independent of the draw for October 15th — and the receipts prove it.
05 Project it, do not narrate it
Students trust what they can see. Run draws on the projector with the entry list visible. The seed chip on screen means a skeptic can verify the draw at home from your class page link — turning suspicion into a math exercise.
Same seed + same list = same result. Teach your students that sentence in the first week. It converts every future fairness argument into a two-minute verification exercise — and ends the "the wheel is rigged" conversation for good.