Decision Trees

Unit 2 puts students inside the logic AI uses to classify: the decision tree. Across five 30–45 minute lessons, learners ask yes/no questions, build branching trees, fix rules that break, and design and test their own decision tree from start to finish.

The 5 lessons

1. 1

   What Is a Decision Tree?

   30–45 min

   Students learn a decision tree sorts things step by step using simple yes/no questions.

   Vocabulary: decision tree · branch · yes · no

2. 2

   Yes/No Questions

   30–45 min

   Learners write clear yes/no questions that split a group in two — the building blocks of a good decision tree.

   Vocabulary: question · classify · branch

3. 3

   Build the Tree

   30–45 min

   Kids build a two-step decision tree and test it by running items through each branch.

   Vocabulary: branch · rule · classify

4. 4

   When Rules Break

   30–45 min

   Students find and fix a weak sorting rule, discovering how unclear or overlapping questions make a tree fail.

   Vocabulary: rule · branch · mistake

5. 5

   Decision Tree Challenge

   30–45 min

   Learners design, test, and improve their own decision tree, then explain how it works.

   Vocabulary: decision tree · rule · branch