Most must act on their own, without state or county assistance.
The CORE Data Collaborative would serve districts that together enroll 30 percent of the state's students.
A new analysis says federal system would discount California's school climate, college and career indicators.
They cite innovative work measuring high school readiness and learning mindsets.
Reducing the subgroup size gives a more complete picture of performance, a new study finds.
Researchers criticize CORE districts' use of student surveys of their social-emotional skills.
The federal government grants a waiver from the last vestige of No Child Left Behind.
Explore the role the Common Core-aligned Smarter Balanced tests are playing as California revamps its testing and accountability system.
CORE districts hope the new school improvement system will become permanent.
Districts will develop middle school students' soft skills, such as perseverance.
Districts must negotiate a new form of teacher evaluations with their unions.