Design and Development of Lesson Plans on Elementary Counting Techniques Through The Integration of the DAPIC Problem-Solving Process with the Four Corners and Diamond Graphic Organizers

This article aims to design and develop lesson plans by integrating the DAPIC Problem-Solving Process with

the Four Corners and Diamond Graphic Organizers. The lesson plan design incorporates the DAPIC Problem-Solving

Process along with the Four Corners and Diamond Graphic Organizers, consisting of five steps: Step 1 Define, Step 2

Assess, Step 3 Plan, Step 4 Implement, and Step 5 Communicate, Exchange, and Summary. The developed lesson plans

cover two topics: (1) The Elementary Counting Techniques (the Addition and Multiplication Principles) and (2) Linear

Permutations (of Distinct and Indistinct Objects). The quality of the lesson plans was assessed by experts, and their

feedback was used for revisions before the implementation. The assessment results, based on a Likert scale, indicated an

“Excellent” level of quality. This suggests that the lesson plans can be beneficial for mathematics teachers in applying

them to classroom instruction to enhance students’ mathematical problem-solving skills, particularly for the high school

students.