This project builds on an existing analog test of children\'s speech intelligibility (Test of Children\'s Speech or TOCS) developed by the researchers. This tool measures how well a child can make his or her spoken messages understood by listeners. This is an important outcome measure of treatment effectiveness and is useful in classifying the severity of a child\'s speech disability. The TOCS+ Project will greatly increase the scope, power and clinical usefulness of this instrument by moving it to a computer-based platform. This will expand the perceptual and acoustic analyses of the test recordings of the children\'s spoken responses. It will also include links to software to test related speech perception and spelling abilities. The new system will be called the Test of Children\'s Speech and Spelling Plus (TOCS+). It is being designed so that the results identify effective ways to increase a particular child\'s speech intelligibility. These results will be linked with treatment modules to increase speech intelligibility that can be used by clinicians and families. The practical impact of this computer-based assessment, analysis and treatment system includes: 1) the time that will be saved by speech-language pathologists in obtaining relevant diagnostic information; 2) the value of this information for management programming; 3) availability of a standardized tool to monitor longitudinal change in speech intelligibility as a result of specific interventions; and 4) the availability of treatment modules to assist clinicians in focusing intervention on specific error patterns that have been identified as contributing to the speech intelligibility deficit. This project will provide a significant tool for research on speech intelligibility and in building models of how speech intelligibility develops in children with normal and disordered speech motor control. Speech-language pathologists and the agencies that employ them will benefit in saved time and improved practice. Ultimately, Canadian children with speech motor control problems should receive appropriate treatment and should have better outcomes that enhance both speech production and literacy skills. Many aspects of TOCS+ could also be used to identify and help other children with speech intelligibility deficits due to hearing loss, structural differences, or of unknown origin, all of whom who are also at risk for reading and spelling disabilities. More details about the TOCS+ Project can be found at our website: www.tocs.plus.ualberta.ca