What does contractor compliance with the Electronic Industries Alliance Standard 748 (EIA-748) Earned Value Management System (EVMS) guidelines require? 1) Changes to the Performance Measurement Baseline are incorporated at least 6 months after work starts on the change effort. 2) Retroactive changes are allowed to adjust for excessive cost on schedule variences. 3) Changes to the performance measurement baseline (PMB) are carefully tracked and controlled. 4) Budget changes are made independently of scheduling changes.