What is the difference between the Test of Nonverbal Intelligence and the Primary Test of Nonverbal Intelligence?

The Test of Nonverbal Intelligence (TONI) has an age range of 6 y.o. thru 89 y.o. The Primary test (PTONI) is for children 3 thru 9 y.o. Each provides an assessment of General Nonverbal Intelligence which can be reported various ways: Standard Score, Percentile, Age Equivalent. There are many 'nonverbal tests of intelligence. Another one in the TONI line is the Comprehensive Test of Nonverbal Intelligence (CTONI), which looks at analogic, sequential and classification reasoning skills. It provides several scores based on those skills and combinations thereof. +++++++ Both tests measure aspects of perceptual, abstract and conceptual reasoning. The PTONI has 8 alternative language administration instructions in the manual, including Japanese, Chinese (Mandarin), Vietnamese, Korean, and French - among others. The TONI is in it's third edition and may soon be revised to it's fourth edition.