First is core intelligence. Many carpenters have bright, shiny tool boxes with all the latest equipment, but they sit on them all day because they can't figure out how to use all those wonderful, sophisticated tools. It's not about the quality of the tools, it's about the quality of the person and the willingness to use the tools that are available.
Core intelligence is can-do.
It can definitely be measured. Second is a person's value system. Just as selling has become a science, we now also have the ability to measure values with precision. One of the most important developments of this century is axiology, the science of values. Axiology was developed over several decades by Dr. Robert S. Hartman as a means of allowing us to evaluate our decision making processes and learn to improve our valuing capacity.