Final answer:
Regular use of the comprehensive database is most effective in strengthening instructional decision-making.
Step-by-step explanation:
The regular use of the comprehensive database that includes standardized test results, classroom assessment results, and report card grades by teachers is likely to be most effective in promoting the achievement of strengthening instructional decision-making. By accessing and reviewing existing information and entering new information into the database, teachers can gain valuable insights into student progress and tailor their instruction accordingly. This allows teachers to make informed decisions about their instructional strategies and interventions, ultimately improving student achievement.