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 — Observation-journal defense

Scored against the observation-journal defense rubric · running across the whole term.

Setup. The student brings the dated sky-observation journal they have kept at home for weeks — moon phases night after night, a planet creeping against the stars, sunspots, the turning constellations — and walks you through it. You name a stretch of entries; they narrate what they saw, sketched, and inferred while you follow the dates and the drawings. Because it is a personal, time-stamped record built over the term, there is nothing to generate: the pattern is either in the pages or it isn't.

The question ladder:

• Record: "Show me this week of entries and tell me what you observed." (Are the entries dated, consistent, and honestly their own?)
• Pattern: "Trace the shape you found across these nights — walk me through it." (Do they read the lunar cycle, or a planet's drift, from their own data rather than a memorized fact?)
• System: "Why does the Moon run through those phases in that order?" (Do they connect the record to the Sun–Earth–Moon geometry behind it?)
• Counterfactual: "If you'd started this journal a month later, how would these entries look different and why?" (This is the rehearsal-proof rung — a memorized answer dies here.)

Demonstration 2 — Timed sky-and-data reading

Scored against the timed sky-and-data reading rubric · after Units 02–04.

Setup. Under a time limit, the student reads a star chart to locate what's up tonight, or interprets real astronomical data — a light curve, an H–R diagram, a spectrum — and justifies the reading aloud. The clock is the integrity mechanism: there is no time to look anything up, and reading a chart or a curve correctly on the spot can't be generated.

The question ladder:

• Read & orient: "Set the chart for tonight and tell me exactly what you find." (The skill itself — orienting the chart, naming what's above the horizon.)
• Interpret: "What is this light curve (or H–R diagram, or spectrum) telling you, and which feature told you?" (Can they justify the reading from the evidence in front of them, not from memory of a worked example?)
• Discriminate: "How do you know it isn't the object that produces a similar-looking trace?" (The recurring confusion pair — this is where a shaky student reveals themselves.)

Demonstration 3 — Oral lab-notebook defense

Scored against the oral 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 moon-phase geometry — come back when you can reason through how the phases would shift if the journal had started a month later.")
• 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.