A classroom instrument for testable ideas
Change one thing.
See what follows.
Build a deterministic model lesson with a prediction prompt, inspectable numbers, and a link learners can replay—no account or code required.
Open the workbenchThree vetted models · works offline after first visit
The method
Make the thinking visible
- 01PredictCommit before changing
- 02VaryMove one parameter
- 03InspectRead chart and data
- 04ExplainName cause and effect
Live drafting sheet
Build a model lesson
Checking connection…
SETUPChoose a model
Choose a model template
Teacher setupLesson copy and required text alternative
Ask about a visible effect that the model can answer.
Describe the marks and axes, not the conclusion. Live results are narrated separately.
MODEL / ROUTE / 001
How local choices shape a route
Assumptions & numeric limits
01Predict
Commit before you move a control
Not committed yet
02Vary
Change one parameter
Use a slider or its exact value. Arrow keys work on every slider.
Same seed + parameters = same result.
03Inspect
Compare the picture with the values
Simulation plot
LIVE OUTPUT
Underlying valuesSCREEN-READER READY
Scroll sideways to inspect all columns on a small screen.
04Explain
Name what changed and what followed
Explanation not complete