The Test of Written Spelling, Fourth Edition (TWS-4) assesses the ability to spell and is administered using a dictated word format. The TWS-4 has two equivalent forms, which make it more useful in test-teach-test situations. It can be used for three specific purposes:
- Identify students who might need interventions designed to improve spelling proficiency
- Document overall progress in spelling as a result of intervention programs
- Serve as a measure for research efforts designed to investigate spelling
Studies have been added to show that there is no gender or racial bias in the TWS-4 items. Test reliability was studied in various ways: coefficients alpha, alternate form, test-retest, and interscorer. Coefficients were all over .90, a fact that testifies to the test's reliability. The TWS-4 provides users with standard scores that have a mean of 100 and a standard deviation of 15, percentiles, and both grade and age equivalents.