The knowledge about affix plays a vital role in the development of word knowledge and vocabulary acquisition. A test for diagnostic information on the level of affix knowledge would be useful in order to inform the test users of what learners have gained or lacked in this integral component of vocabulary knowledge. This paper reports the…

This article describes the development and validation of the new CATSS (Computer Adaptive Test of Size and Strength), which measures vocabulary knowledge in four modalities -- productive recall, receptive recall, productive recognition, and receptive recognition. In the first part of the paper we present the assumptions that underlie the test --…

No Child Left Behind (NCLB, 2001) included a broad spectrum of changes to the federal role in public education, including accountability provisions that mandated states to test all students. In an atmosphere of educational reform and federally mandated high-stakes testing, demands have increased for progress monitoring strategies that reliably…