SCIENCE · INVESTIGATE AND EXPLAIN

Write a procedure someone can repeat

Make a scientific method traceable.

Learning outcome: Specify units, reference, resolution, correction and retained observations.

Starting recap

Reproducibility requires enough information to reconstruct a calculation and its inputs.

All lessons are open directly. Your saved experiments remain when you leave and return.

Try

A report says only that a ruler was calibrated and the answer was about ten.

Open the experiment

Predict

Which missing detail would prevent someone from reproducing the corrected mean?

Your prediction and reason

Experiment

Choose an offset and resolution, capture the run, and write a procedure that reproduces it.

Calibrate a length reading

Worked teaching model · synthetic values · Three programmed deviations of −0.2, 0 and +0.2 cm illustrate repeat readings. They are not random samples. The reference length is exactly 10 cm in this model.

Instrument offset: 1 cm Instrument resolution: 0.5 cm

Reset keeps your prediction, captures and practice history.

Calculated values on the same fixed scale
Row	Quantity	Value (cm)
1	Reading 1	11
2	Reading 2	11
3	Reading 3	11
4	Known reference	10
5	Mean reading	11
6	Offset-corrected mean	10

Mean error: 1.000 cm. Offset correction leaves 0.000 cm error.

Correct each reading by subtracting the offset. Quantization can remain after correction; identical rounded readings do not imply perfect accuracy.

Observation to attach to a capture

Captures preserve recipes and replay their calculated results. They are synthetic model evidence, not physical measurements.

Understand

A result needs a reconstructable method

A scientific procedure should say what was measured, with which units and resolution, against which reference, and how the result was calculated. “We calibrated the ruler” leaves important choices hidden.

For the default lab, a reproducible description specifies the 10 cm exact teaching reference, +1 cm offset, 0.5 cm resolution and programmed deviations −0.2, 0 and +0.2 cm. Rounding produces three 11 cm readings. Their mean is 11 cm; subtracting the offset gives 10 cm.

Someone should be able to reproduce that calculation without guessing the settings. Save the input recipe and retain raw readings rather than recording only the corrected output.

Reproducible does not mean independently confirmed

Another person replaying the same synthetic inputs checks the procedure’s implementation. A new physical measurement tests additional claims about the instrument and environment. Both are useful, but they are different evidence.

Include the rounding rule, exclusions and transformations. If a reading is omitted, record why and show whether keeping it changes the conclusion. Exported text is a report, not authenticated proof that an experiment occurred.

Write a procedure for one of your nondefault captures. Ask whether a reader could obtain the same rows from it, and identify the first missing detail that would prevent replay.

Apply

Public practice checks a specific claim. It does not establish independent mastery.

Include raw readings, correction, units, rounding and the programmed-noise limitation.

Your explanation and limitations

Continue

Completion requires a saved prediction, at least one capture and a reflection. Presence checks do not grade your reasoning.

Skipping retains experiments and awards no mastery.

Previous: Test a model beyond its tuning cases Next: Defend a claim and revise its limits

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