Well, actually, out of level achievement of the EXPLORE or ACT variety would add some information, as the WJ, like all of these age-normed standardized tests, does not give genuine grade-level-equivalent information. As I've mentioned elsewhere, grade- and age-equivalents do not represent the actual instructional level of an individual. They are derived from the number of items correct that the median member of the norm group referenced obtained. That is, a grade-equivalent of 6.3 does not mean that your child's instructional level is the third month of grade six. It means that they obtained the same number of correct items on this particular task as the median member of the grade 6.3 norm group did in the standardization sample. How they got to that number correct does not figure into it. (E.g., repeatedly missed three or four items in a row, but then one correct one, and so ended with a very high most-difficult-item, but with tons of holes in skills on the way up.) Also, many grade 6.3 students would not be able to demonstrate mastery of grade 6.3 skills (half of them, actually, if based on a grade-equivalent). Because these kinds of tests are intended to sample overall performance, not demonstrate mastery of a skill area, there are very few items of each type.
Norm-referenced tests of the WJ variety are designed to order individuals in the normative group, not determine their actual "level".
The Lexile may be useful for schools, as most of them understand the language of that scale. Also, it's not an age norm-referenced test.
And EXPLORE, etc. are group/computer-administered tests, which don't need a psychologist (think SAT-type format).
