This school improvement project explored the effect that shared leadership and collective efficacy have on student achievement. Participants include 47 staff members from six different elementary schools in the Ottumwa Community School District. Participants spent the 2020-2021 school year attending monthly meetings and professional development sessions creating common assessments, rubrics, and curriculum. FAST data was collected to determine if the new committee of staff members influenced student scores in grades 2-5. It was determined that there was no positive or negative impact on student achievement based on the implementation of the Curriculum Council.