A teacher keeps the students' work of language use and uses it for assessing the learners' achievement. What is this strategy for assessment known as?

Portfolio assessment involves systematically collecting samples of student work over time to assess learning, growth, and achievement. The teacher's practice of keeping students' language-use work for assessment is the defining feature of portfolio assessment. Diagnostic tests identify learning gaps, CCE is a broader Indian assessment framework, and summative assessment is end-of-period evaluation. Portfolio assessment specifically uses collected work samples.