Yet, most of the concentration of study and implementation has happened at the elementary level. In order to find resources to help develop secondary level curricula using MI, you first have to wade through three times as much information pertaining to elementary levels. I believe that it is important to continue these strategies after elementary school and up through high school. Students feel better about their own intelligences and often learn more as a result. That shouldn't end with elementary school.
Reality is a factor, however.
MI can still be involved in high school curriculum and assessment some of the time. Let students perform a play instead of taking a test over it. Allow students to pick their own projects, clear it with you, and they can continue to develop their own strengths. There are many opportunities left for high school students to learn with MI strategies. See the Assessment and Strategies page for more ways of incorporating MI into secondary education.