This is a working draft for Leslie's review. All three demonstrations are scripted; edit the question ladders and example exchanges freely. Each demonstration is scored against its published rubric — this page is how to run it, not the rubric itself.
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
- 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.
- 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.
- 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.
Every demonstration below climbs the same shape: from recall at the bottom to a rehearsal-proof rung at the top. Keep climbing until you reach the student’s real ceiling — a memorized answer falls off near the top.
Demonstration 1 — Field quadrat / transect defense
Scored against the field quadrat / transect defense rubric · after Unit 02.
Setup. The student runs a biodiversity survey on their own plots — their quadrat placement, their transect line, their species counts. You name the site and the sampling target; they lay the quadrat, record what they find, and work the density or diversity estimate from their counts out loud while you watch their hands and listen to their reasoning. Because it's their sampling and their calculation, there is nothing to outsource.
The question ladder:
- Procedure: "Run the quadrat here and give me your counts." (Can they place a clean, defensible sample?)
- Calculation: "Work the density or diversity index from your counts — show me the steps." (Do they connect the raw counts to the index, not a memorized formula?)
- System: "Why this quadrat size and placement for this habitat?" (Do they understand representative sampling versus a convenient spot?)
- Counterfactual: "If you'd placed your quadrats along the path instead of at random, how would your result change and why?" (This is the rehearsal-proof rung — a memorized answer dies here.)
Demonstration 2 — Timed data interpretation
Scored against the timed data interpretation rubric · after Unit 05.
Setup. Under a time limit, the student reads an unfamiliar environmental dataset — a population curve, a pollutant-concentration record, a climate trend — and interprets what it shows. The clock is the integrity mechanism: there is no time to look anything up, and the skill of reading a real dataset and justifying the call honestly can't be generated.
The question ladder:
- Read & observe: "Read this dataset and tell me exactly what it shows." (The interpretation skill itself — trend, peak, inflection.)
- Interpret: "What is happening here, and which feature of the data told you?" (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 a reading that looks similar but means something else?" (Correlation versus causation, or a confounded trend — 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
| Mastered | Approaching (“not yet”) |
|---|---|
| Answers the counterfactual rung without hesitation — reasons forward from understanding. | Strong on recall rungs, collapses at the counterfactual. The understanding is memorized, not built. |
| Owns anomalies and sources of error, and reasons about them. | Hides or hand-waves the data that doesn't fit. |
| Connects the observation to the mechanism and the survey to the concept unprompted. | Knows the result in isolation; can't trace the environmental science behind it. |
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 quadrat sampling — come back when you can reason through how biased placement shifts the result.")
- 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.
- Coach or hint during the demonstration — including tone, eyebrows, and "hmm."
- Ask leading questions that contain the answer.
- Let partial credit creep in. There is no 7-out-of-10 here — the bar is cleared or it isn't.
- Move the bar for a likeable student, a tired afternoon, or a parent in the room.