McLeod (speech and language acquisition, Charles Sturt U., Australia) and Singh, a scholar of communications sciences currently chair of Plural Publishing, offer a tool by which speech-language pathologists and people with communication disorders can compare the production mechanics of any two speech sounds. It is 5.5" wide and 9" high, spiral bound at the top. Each page is divided vertically, but the two halves are identical, so that information about all speech sounds are treated on both halves. Users flip the pages on one side to one speech sound, and on the other to another sound, then compares them side by side. The information on each includes the phonetic symbol for the sound, a photographs of the lips, a drawing of the side view of the mouth (also indicating voiced or unvoiced), a chart of palate contact, and a sonogram of the position of the tongue. Annotation ©2009 Book News, Inc., Portland, OR (booknews.com)