There were two approaches aimed at the solution of speed and power problem in intelligence testing. These approaches were critically discussed on the basis of hypothesis about the conception of speed components that working time is decided by two speed factors, i.e., one dependent completely on the power ability (Sa) and the other one independent on power (Sg).
Main purposes of the present study were to discuss the rightfulness of new methods deriving directly the non-intellectual components of speed (Sg) from the Sg-Test and examining the effects of Sg on the scores of intelligence test with time limits. Results showed that Sg-test used in the present study was valid enough and that Sg was found to have the contaminating effects on the total scores of the intelligence test used, especially on the sub-tests covering "Verbal" and "Numerical" factors hypothesized and on the sub-tests composed of easy items.