"To determine its elementary school rankings, the Business Journal analyzed the most recent OSPI data on test scores, teacher experience levels, racial and economic diversity and teacher-student ratios. In its analysis, the Business Journal excluded schools with fewer than 10 students, K-12-type schools and schools that didn’t provide all of the data required to calculate the ranking. The analysis only looked at schools in King, Snohomish, Pierce and Kitsap counties."