The TWS-4 assesses a student's ability to spell words whose spellings are readily predictable in sound-letter patterns, words whose spellings are less predictable, and both types of words considered together. The words to be spelt are drawn from 10 basal spelling programmes and popular graded word lists.
Country of origin:
Larsen, Hammill, & Moats, 1999
20 minutes (untimed)
TWS-4 Complete set (includes forms for 50 administrations)