The demonstration-moment script.

The demonstration is the part of the course that cannot be faked, outsourced, or generated. A student stands in front of you and shows understanding in real time, against a rubric, out loud. Your job is to run it the same way every time: a setup that makes faking impossible, a question ladder that probes past rehearsal, and a clean binary verdict recorded against the rubric.

The three rules that govern every demonstration

1. The student does the work; you only ask. No coaching, no leading questions, no "are you sure?" that signals the answer. You probe understanding — you never supply it.
2. The verdict is binary. Mastered or not yet. You are not assigning a score in the room; you are deciding whether the published rubric's bar was cleared.
3. A "not yet" is a checkpoint, not a failure. How you deliver it determines whether the student comes back. Name the specific gap, give the re-attempt path, and keep the door open.

Demonstration 1 — Microscope cell defense

Scored against the Microscope Cell Defense rubric · after Unit 02.

Setup. The student finds, focuses, and identifies cells on the microscope — their slide, their focus knob, their call on what each part is. You hand them a prepared slide (onion skin, cheek cells, or pond water); they bring it into focus, name the cell and its parts out loud, and say what each part does while you watch their hands and listen to their reasoning. Because it's their focusing and their identification, there is nothing to outsource.

The question ladder:

• Procedure: "Bring these cells into focus and show me a clear view." (Can they work the microscope and get a sharp, honest image?)
• Name & observe: "Point to each part and tell me what it is." (Do they know the cell membrane, nucleus, cytoplasm, and the rest — in a real cell, not just a diagram?)
• System: "What does each part do, and how can you tell this is a plant cell and not an animal cell?" (Do they connect structure to job, and read the evidence in front of them?)
• Counterfactual: "If this slide had come from your cheek instead of an onion, what would look different and why?" (This is the rehearsal-proof rung — a memorized answer dies here.)

Demonstration 2 — Timed classification challenge

Scored against the Timed Classification Challenge rubric · after Unit 06.

Setup. Under a time limit, the student sorts and keys out a tray of organisms by their observable traits — using a dichotomous key, hand lens, and field guide — and records each call. The clock is the integrity mechanism: there is no time to look anything up, and the skill of reading a trait and working a key honestly can't be generated.

The question ladder:

• Observe: "Look closely and tell me exactly what traits you see." (The hands-on skill itself — body shape, covering, legs, symmetry.)
• Key it out: "Work the key and tell me what group it's in, and which trait sent you each way." (Can they justify the call from the evidence in front of them, not from memory of a worked example?)
• Discriminate: "How do you know it isn't the look-alike organism that ends up one branch over?" (The recurring confusion pair — this is where a shaky student reveals themselves.)

Demonstration 3 — Oral lab-notebook defense

Scored against the lab-notebook-defense rubric · end of each unit.

Setup. The student walks you through their own notebook: the question, the method, the data, the anomalies, the interpretation. Because it is their recorded work, the defense is unfakeable — a student who didn't do the thinking can't narrate the decisions behind it.

The question ladder:

• Narrate: "Walk me through what you did and why." (Does the story hold together?)
• Anomaly: "This data point doesn't fit — what happened?" (Did they notice, and can they reason about it honestly rather than hide it?)
• Method critique: "What would you change if you ran it again?" (Do they understand the method's limits and sources of error?)
• Transfer: "How does this connect to the concept from this unit?" (Integration — scored on its own line.)

Reading the room: mastered vs. approaching

Recording the verdict

Mark the rubric in the room while it's fresh — pass or not-yet on each rubric line, with a one-line note on the deciding moment. If the verdict is "not yet," that note becomes the re-attempt instruction. Do not soften the rubric to avoid an awkward conversation; soften the delivery instead.

Delivering a "not yet" so the re-attempt stays likely

• Lead with what was solid before naming the gap — the student needs to know the work wasn't wasted.
• Name one specific thing to close, not a list. ("The counterfactual on the cell defense — come back when you can explain how a cheek cell would look different from an onion cell, and why.")
• Give the date and the path. A "not yet" with a re-attempt slot on the calendar is a checkpoint; a "not yet" with no path is a wall.