This document outlines the principles of classroom assessment for the K-12 Basic Education Program in the Philippines. It discusses assessment as a joint process between teachers and learners to holistically measure abilities. Appropriate assessment considers learners' zones of proximal development and enables them to display independent knowledge and skills. Both formative and summative assessments are discussed, with formative used to improve instruction and check effectiveness, while summative measures if standards are met. The focus is on ensuring students learn through a collaborative culture centered around results.