10 teachers from 10 high schools in Israel participated in an alternative assessment of a new high-school science curriculum. An evaluation study was conducted at the start of the workshop and at its completion to determine if the workshop goals were attained. Teachers felt more self-confident following the workshop, and students felt that their involvement in decisions improved their sense of responsibility for their achievement. In addition, the new interdisciplinary curriculum requires a professional development program that will stimulate teachers’ creativity and diversify the instructional strategies that they use in the classroom.