Topeka, Kansas - The Kansas Board of Education voted 6-4 to include greater criticism of evolution in its school science standards, but it decided to send the standards to an outside academic for review before taking a final vote.

The Kansas school system was ridiculed around the country in 1999 when the board deleted most references to evolution. The system later reversed course, but the language favored by the board Tuesday comes from advocates of intelligent design.

The intelligent design concept holds that some features of the natural world are best explained by an unspecified intelligent cause. Evolution is a fundamental scientific theory that species evolved over millions of years through natural selection.

The standards are used in developing state tests for fourth, seventh and 10th-graders, though local schools have the final say on what is taught in their classrooms. Students will be tested on the new standards in the 2007-08 school year.

The board is expected to vote on final approval of the standards in October.