In a recent report on a set of studies involving IB, a number of positive results were reported, including indications “that a higher percentage of MYP students achieved proficient or advanced performance on mathematics and science assessments.”
A significant set of the results from observation conducted here in Texas supported IB as generally involving better student engagement.
Additionally, “teachers reported that on the whole they believed the MYP benefited students by encouraging higher order thinking and educating the whole child. ”
For more details, see the report on the IB web site: http://www.ibo.org/globalassets/publications/ib-research/mypkeyfindingssheetweb-3.pdf