पहला औपचारिक, व्यावहारिक बुद्धि परीक्षण विकसित करने का श्रेय किसे दिया जाता है?

In order to have excellent decision-making skills, a person needs to have ________ intelligence.

Who proposed the hierarchical model of intelligence featuring two major group factors: v:ed (verbal-educational) and k:m (spatial-mechanical)?