Final answer:
Analyzing student performance data before and after implementing the program is the most effective approach in determining if teachers should continue using a reading program.
Step-by-step explanation:
The most effective approach in determining if teachers should continue using a reading program is analyzing student performance data before and after implementing the program. By comparing the data, you can see if there is a positive impact on student learning and achievement. This approach provides concrete evidence of the program's effectiveness.
While other approaches like conducting surveys, observing classroom instruction, and reviewing research studies can provide valuable insights, analyzing student performance data allows for direct measurement of the program's impact on student outcomes.