The system that Baltimore will need to devise to assess its teachers under a new groundbreaking contract will rely heavily on statewide reforms of teacher evaluations, education officials say.

The unprecedented autonomy and performance-based pay scale outlined for teachers in the tentative Baltimore Teachers Union contract announced Wednesday comes at a time when Maryland is developing a plan for 50 percent of a teacher's evaluation to reflect student achievement.

This was a critical point in negotiating the Baltimore contract, said schools CEO Andrés Alonso. "We wanted the contract to be aligned with [the state] and about outcomes, which is so murky right now," he said.

The new agreement would give city teachers the highest starting