This document provides an abstract and introduction for an action research study on the effects of project-based learning using the Understanding by Design framework on 6th grade science students' achievement and attitudes in the Philippines. It discusses the poor performance of Philippine students in science based on international and national tests. It argues that a more constructivist, student-centered approach like PBL is needed rather than the traditional teaching methods commonly used. The study aims to examine if PBL using UbD improves students' test scores and attitudes at a public elementary school in Caloocan City. It describes the two groups of students involved and the diagnostic testing used to select and compare them.