For the record, Silverman's position on the LM is not necessarily shared by others with similar credentials in GT research. Nancy Robinson, one-half of the GT research power couple for whom the UW Robinson Center is named, went so far as to publish an article in the Roeper Review (
http://www.davidsongifted.org/search-database/entry/a10128) arguing for moving on from the LM to tests with updated norms and design (at the time, we were only up to the SBIV).
At the simplest level of arguments for using SBLM for clinical uses only (not quantitative), it is apparent from a large body of contemporary research that cognitive development does not stop at age 16.
