The Philippine Informal Reading Inventory (Phil-IRI) is a diagnostic tool used by teachers to determine students' reading levels. It consists of graded word lists and passages in both English and Filipino, as well as forms for recording student performance. The Phil-IRI helps identify students' independent, instructional, and frustration reading levels through individual oral reading, silent reading, and listening comprehension assessments. It also monitors reading growth and the effectiveness of instruction. All students in Grades 3 to 6 take the group screening test, while those reading below grade level undergo further individual assessment. The Phil-IRI is administered at the beginning and end of the school year.