C.8 Evaluate the validity and reliability of measurement procedures

The concepts of validity, reliability, and precision are essential to ensure that the measurements used in teaching and learning are meaningful and represent significant data. Below, these terms are explained with practical examples for parents and teachers.

Validity The extent to which a measurement tool measures what it is intended to measure. A valid measurement ensures that the results represent the concept being evaluated. Example: A valid intelligence test measures a person’s intelligence, not their reading ability or general knowledge. In practice: If you are evaluating a student’s reading comprehension, a valid test should specifically measure their ability to understand texts, not just their reading speed.

Reliability or reliability The consistency of a measurement tool, meaning its ability to produce the same results repeatedly, regardless of who uses it or when. A reliable measurement ensures stability and uniformity in the results. Example: A reliable thermometer will give the same reading every time it is used, regardless of who operates it. In practice: If a teacher is evaluating a student’s participation, a reliable procedure should record similar results whether observed at different times or by different observers.

Precision The closeness between the observed value and the actual value of what is being measured. A precise measurement guarantees that the results accurately reflect reality. Example: A precise thermometer will show the exact temperature of a patient, not an approximation. In practice: When recording how long a student takes to complete a task, a precise stopwatch will ensure the data is accurate and useful for planning future strategies.

🔑 Key Questions 🔑

• Does the measurement tool truly evaluate what we want to measure? (Validity)

• Will the same results be obtained if another person performs the measurement or if it is repeated later? (Reliability)

• Do the results accurately reflect the observed behavior or skill? (Precision)

By evaluating the validity, reliability, and precision of measurement procedures, we can:

• Ensure that educational decisions are based on solid and representative data.

• Identify areas where teaching methods need improvements or adjustments.

• Promote every student’s success by clearly understanding their needs and progress.

Understanding and applying these concepts helps foster effective collaboration between parents, teachers, and professionals to support students' learning and development.