Educational assessment - Classification of Assessment Types

Types of Assessment Understanding the different types of assessment is fundamental to evaluating student learning effectively. Assessment can be categorized in multiple ways depending on when it occurs, how it's structured, what it measures against, and who administers it. Each type serves a distinct purpose in the teaching and learning process. Placement, Formative, Summative, and Diagnostic Assessment These four categories describe when assessment occurs and what purpose it serves in the instructional cycle. Placement assessment (also called pre-assessment, initial assessment, or threshold knowledge test) happens before instruction begins. Its purpose is to establish a baseline of what students already know and can do. A teacher might use a placement assessment to determine whether students are ready for advanced content or need foundational review. Importantly, placement assessments are generally not graded—they're diagnostic tools to inform teaching decisions, not evaluative measures. Formative assessment occurs throughout a course or project as instruction is happening. Think of formative assessment as assessment for learning rather than assessment of learning. Teachers use formative assessments to provide ongoing feedback that helps students improve. Examples include classroom discussions, exit tickets, quizzes, peer feedback, and self-assessment. Formative assessments may involve feedback from teachers, peers, or the students themselves, and they typically are not graded (or if they are, the grades don't count significantly toward the final grade). The key insight is that formative assessment guides learning in real time. Summative assessment occurs at the end of a course, unit, or project. Its purpose is to evaluate overall learning and assign grades. Summative assessments are typically graded and contribute to a student's final grade. Examples include final exams, major projects, standardized tests, and end-of-unit tests. Summative assessment answers the question: "What did the student learn overall?" Diagnostic assessment focuses on identifying specific difficulties that emerged during the learning process. A teacher might use diagnostic assessment after noticing that many students struggled with a particular concept. The results guide the design of instructional interventions—targeted re-teaching, small group instruction, or different explanations. Diagnostic assessment helps answer: "Where did learning break down, and what can we do about it?" Objective and Subjective Assessment These categories describe the nature of the questions and how responses are scored. Objective assessment uses questions that have a single correct answer that can be scored definitively without interpretation. Common objective question formats include: True-false items (one correct answer) Multiple-choice items (one correct answer among several options) Multiple-response items (more than one correct answer; students select all that apply) Matching items (connecting items from one column to another) The strength of objective assessment is reliability—different scorers will arrive at the same score because the correct answer is predetermined. Objective items are also efficient to score. However, they can be limited in measuring complex, higher-order thinking. Subjective assessment uses questions that may have multiple acceptable answers or that require expressive responses from students. Common subjective formats include: Extended-response items (short-answer questions where students provide explanations) Essays (longer, more developed written responses) Performance assessments (demonstrations of skills or abilities) Subjective assessments can measure deeper understanding and complex thinking, but they require more time to score and depend more heavily on the scorer's judgment and expertise. This is why subjective responses are often scored using rubrics—clear scoring guides that define what constitutes different levels of quality. Basis of Comparison Assessment scores can be interpreted in different ways depending on what they're being compared against. Criterion-referenced assessment measures performance against defined criteria or standards rather than against other students. The question being answered is: "Can the student do X at the specified level?" For example, a driving test is criterion-referenced—you must demonstrate that you can perform specific driving tasks safely, regardless of how other test-takers perform. In education, criterion-referenced assessments measure whether students have met learning objectives or standards. A student either meets the criterion or doesn't, independent of peer performance. Norm-referenced assessment compares a student's performance to that of a peer group (the "norm"). The question being answered is: "How does this student's performance compare to similar students?" Intelligence quotient (IQ) tests are the classic example of norm-referenced assessment. Your score is meaningful only in relation to how others scored. Percentile ranks (e.g., "in the 85th percentile") are typically how norm-referenced results are reported. The choice between criterion-referenced and norm-referenced assessment depends on the purpose. If you want to know whether a student has mastered specific content or skills, use criterion-referenced assessment. If you want to identify which students are performing relatively better or worse within a group, norm-referenced assessment is more useful. Many classroom assessments are criterion-referenced (aligned to learning standards), while standardized tests are often norm-referenced. Formal and Informal Assessment These categories describe the structure and grading status of assessment. Formal assessment is a structured, written instrument that receives a numerical score or grade. Examples include tests, quizzes, research papers, projects with scoring rubrics, and standardized tests. Formal assessments contribute to a student's official grade record. They are planned in advance, carefully constructed, and systematically scored using established criteria. Formal assessment is intentional and documented. Informal assessment does not contribute to a final grade and is typically more flexible and spontaneous. Informal assessment includes: Observations (watching and noting student behavior or understanding) Checklists (marking whether students demonstrate specific behaviors or skills) Rating scales (evaluating performance on a continuum) Rubrics (detailed scoring guides describing different quality levels) Portfolios (collections of student work over time) Participation records (noting contributions during class) Peer and self-evaluation (students assessing themselves or classmates) Class discussions (listening for understanding during dialogue) Informal assessments are valuable because they're often less intimidating to students and can capture learning in authentic contexts. However, they're typically not part of the official grade, though teachers certainly use the information to inform grading and instruction. Internal and External Assessment These categories describe who designs, administers, and scores the assessment. Internal assessment is designed, administered, and marked by the school or teachers themselves. The result is immediate feedback to students. Teachers have full control over the assessment design and can align it precisely to their curriculum. Internal assessments can provide detailed, personalized feedback. Most classroom assessments—unit tests, quizzes, projects—are internal assessments. External assessment is designed by an outside governing body (such as a state education agency or national testing organization) and marked by independent personnel not affiliated with the student's school. Examples include standardized tests, Advanced Placement (AP) exams, and International Baccalaureate (IB) exams. External assessments may provide limited feedback to students, though some do include detailed criterion-based comments. The strength of external assessment is that it provides comparable data across schools and districts. The limitation is that schools have less control over alignment to their specific curriculum.