The study determined whether Math Scene Investigator (MSI) Cognitive Strategy could lead to measurable improvement in students problem-solving skills through assessment of students performance before and after implementing the strategy. The experimental group consisted of Grade 9 students from public high school in the School District of Pila, Province of Laguna. The primary instrument used was a validated researcher-made test that consisted of four problem solving tasks with guide questions. Results showed improvement in problem-solving skills of Grade 9 students in terms of Frequency and Variety of Approaches from Good to Excellent, and improvement in problem-solving skills of Grade 9 students from Poor to Very Good in terms of both Degree that Approaches are Pursued and Success/Correct Answer. The significant difference between the mean post-test score after utilization of Math Scene Investigator (MSI) Cognitive Strategy and the mean pre-test score of Grade 9 students before utilization of Math Scene Investigator (MSI) Cognitive Strategy support claim of the effectiveness of the utilization of Math Scene Investigator (MSI) Cognitive Strategy in enhancing, or improving, the problem solving skills of students in terms of Frequency and Variety of Approaches, Degree that Approaches are Pursued, and Success/Correct Answer. Mathematics teachers were encouraged to integrate the MSI Cognitive Strategy into regular instruction, especially when teaching word problems. Focus should be placed on helping students understand problems, identify key word clues, plan effectively, and check their answers. The study determined whether Math Scene Investigator (MSI) Cognitive Strategy could lead to measurable improvement in students problem-solving skills through assessment of students performance before and after implementing the strategy. The experimental group consisted of Grade 9 students from public high school in the School District of Pila, Province of Laguna. The primary instrument used was a validated researcher-made test that consisted of four problem solving tasks with guide questions. Results showed improvement in problem-solving skills of Grade 9 students in terms of Frequency and Variety of Approaches from Good to Excellent, and improvement in problem-solving skills of Grade 9 students from Poor to Very Good in terms of both Degree that Approaches are Pursued and Success/Correct Answer. The significant difference between the mean post-test score after utilization of Math Scene Investigator (MSI) Cognitive Strategy and the mean pre-test score of Grade 9 students before utilization of Math Scene Investigator (MSI) Cognitive Strategy support claim of the effectiveness of the utilization of Math Scene Investigator (MSI) Cognitive Strategy in enhancing, or improving, the problem solving skills of students in terms of Frequency and Variety of Approaches, Degree that Approaches are Pursued, and Success/Correct Answer. Mathematics teachers were encouraged to integrate the MSI Cognitive Strategy into regular instruction, especially when teaching word problems. Focus should be placed on helping students understand problems, identify key word clues, plan effectively, and check their answers.