The Decision Tree

Tree Structure

• Irreflexive directed tree
• Question nodes, Decision nodes, Randomizer nodes, Answer nodes

Start at the Question

• Question node: Follow the outgoing edge
• Decision node: Follow the edge labelled by persona parameter value
• Randomizer node: Follow a random edge
• Answer node: Return the answer

New and Old Questions

• Edges from answer nodes to question nodes
• Appropriate new questions added to the interaction panel
• Old and inappropriate questions removed