Barriers have to be identified and removed for students to succeed to their fullest potential, barriers will cause students to disengage, fail to meet lesson goals, or fail the course
ongoing formative assessments identify these barriers, which allows the path to be cleared for students
Only relying on a summitive assessment, students can fail to meet goals as formative is more of checks and balances, where are you, how long did it take, where are you going, how much time do you have to get there, are there "options" to advance at a increased rate without missing something. What needs or can change to improve the path. all of these questions and answers are in formative assessments
