# How to Use This Course (/en/docs/guide)



## Chapter structure [#chapter-structure]

<LessonTemplate />

The first six steps are a small loop of scientific method: notice something, find the variables that might control it, **change one at a time**, observe, build an explanation, and apply it to a real cup.

## Predict before you look [#predict-before-you-look]

Café OS rarely uses multiple choice. More often: before a simulation runs, write down what you expect; afterwards, say what changed; then answer "if the cup turned bitter and drying, what would you change next?" That tests the model, not memory.

## 3D cannot teach taste [#3d-cannot-teach-taste]

This limit is stated up front. Every scene ends by sending you back to the kitchen:

<LearningLoop kind="reality" />

The physical cup remains essential.

## What "mastery" means [#what-mastery-means]

Each concept tracks five levels. "Explained" is much stronger than "lesson completed":

<MasteryList />