Each grade level contains three units made up of between sixteen to thirty-three lessons. Each lesson builds upon previously-taught material, creating a continuous spiral review. Since formative assessments are built into the daily lesson, student performance drives instruction. At the end of each unit, teachers administer a Proficiency Test, a curriculum-based assessment that measures how well students have learned the specific material taught. The Proficiency Test determines whether students have mastered the necessary skills to move ahead in the program. Furthermore, it helps teachers maintain the proper pace of instruction and highlight skills that need reteaching or additional practice. The PAF Program was developed to be implemented beginning in Kindergarten and taught on a daily basis. Each lesson is designed to fit within a class period of 45-60 minutes. Below are suggested times to spend on each component of the lesson. Additionally, the pacing guide provided helps give teachers a sense of how much time is spent on each unit. However, all of the times are suggested. Teachers should make adjustments at their own discretion to fit the needs of their students and depending on the tiered level of instruction.