DepEd Order No. 21, or the Oplan-Baklas Operation, required schools to clear school grounds, classrooms, and walls of “unnecessary artwork, decorations, tarpaulin, and posters.” This study aims to determine the effects of the Oplan-Baklas Operation at elementary levels. The participants are 30 randomly selected elementary teachers in Cebu, Philippines. The results revealed that teachers find the Oplan-Baklas Operation favorable as it lessens expenses, time, and effort in crafting designs. The questionnaire was meticulously crafted to measure various dimensions of the Oplan-Baklas Operation’s impact. Content validity was established through expert reviews to ensure that the items accurately reflected the intended constructs of the teaching-learning process, cultural sensitivity, and educational environment enhancement. This research’s findings strongly support the assessment tool’s content and construct validity, suggesting its appropriateness for assessing stakeholders’ viewpoints on the Oplan-Baklas operation. However, the study did not address reliability testing, which represents a limitation. Thus, future researcher efforts should focus on evaluating the internal consistency to establish the stability and consistency of data gathering and eventually increase the legitimacy and consistency of the findings. More research is also needed in its extended implementation to have in-depth results on the topic.