Measuring up: what educational testing really tells us

If only it were so simple

What is a test?

What we measure: just how good is the sample?

The evolution of American testing

What test scores tell us about American kids

What influences test scores, or how not to pick a school

Error and reliability: how much we don't know what we're talking about

Reporting performance: standards and scales

Validity

Inflated test scores

Adverse impact and bias

Testing students with special needs

Sensible uses of tests.