The sealed test envelope

Can a rule pass the cards it practised and fail new cards?

My prediction

I think _ because _ .

Two fair tests

What I changed What I kept What I observed

My new case

Seal four new cards before selecting a rule. Record the rule before opening the envelope.

Explain and question

My evidence supports _ . It does not show _ . A case that could change my mind is ____ .

Keep your work

Use fictional data. Download a resumable project before changing devices. On a shared device, turn remembering off and clear your work when finished.