A student who is often struggling in school has a hidden intelligence, which if used correctly can make the reluctant learner shine. Learners can use multiple intelligence theory as a means of looking inward. They can self asses strengths and weaknesses to fine tune future performance. For example, a person who does not have a very high linguistic intelligence would have to study extra hard for a foreign language test. The best engine in a race car does not always win the race.
Many factors go into racing.
In turn many intelligences go into begin productive, and happy humans. People who understand multiple intelligences, can use their own intelligences most effectively. As stated in the fourth paragraph, it is difficult if not impossible to prove the theory of multiple intelligences. I myself have taken that leap of faith. I believe that we do have separate intelligences.