Reading proficiency attainment continues to be an educational need. In 2015, only 36% of fourth graders scored at or above the proficient level in reading on the National Assessment for Educational Progress (NAEP). Of perhaps greater concern is that 31% of fourth graders scored below the basic level (National Center for Education Statistics, 2015). With a majority of students failing to meet reading proficiency standards, it is prudent to examine how educators are making instructional decisions to prevent reading failure. Examples of instructional decisions include selecting skills for instructional focus, intervention selection, placing students in instructional groups, determining intensity and frequency of interventions, and determining the need for additional assessments (Hamilton, Halverson, Jackson, Mandinach, & Supovitz, 2009). Deficits in word reading skills are often the root cause for readers who struggle with fluency or comprehension (Carver, 1998; Murray, Munger, & Clonan, 2012). Up to 80% of students with a specific learning disability in reading struggle at the word level (Moats & Tolman, 2009). The ability to accurately and efficiently read words affects reading development, and is highly correlated with overall reading ability (Fuchs, Fuchs, Hosp, & Jenkins, 2001). While accurate word reading does not guarantee reading fluency and comprehension will occur, they are not possible without intact word reading skills. Readers who devote complete attention at the word, or even letter level do not read fluently and have few cognitive resources left for connecting or generating meaning to what they have read (Perfetti, 1986). With the critical importance of word reading to overall ready ability, it is prudent that teachers make accurate and informed instructional decisions to ensure their students acquire effective word reading skills. Word reading skills, which provide readers with reliable strategies for identifying words in text, are often referred to as decoding skills. While there are many decoding assessments that can inform teachers instructional decisions for students with word reading problems, the type of specific information they provide has not been studied. The purpose of this study was to analyze published decoding tests for their diagnostic potential and identify possible instructional implications of these measures. Decoding Word reading skill deficits are most often linked to problems with decoding. Decoding refers to the ability to apply phoneme-grapheme connections to pronounce words. Phonemes are the smallest units of sound in language, and graphemes are the visual representations (i.e., letters) of those sounds in printed text. Decoding is a necessary, but not sufficient, component in the reading process as it assists 749874A EIXXX10.