https://edtechmagazine.com/k12/article/2018/10/data-driven-instruction-how-student-data-guides-formative-assessments-perfcon

When it comes to assessing student knowledge levels, data has empowered more schools to choose formative assessments versus summative assessments. Unlike summative assessments, which provide an overall view of a student’s growth from the beginning to the end of a class, formative assessments allow teachers to assess students as they learn and adjust the curriculum to focus on areas where students may need more help.
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