The design of the marking schedule and moderation of marking procedures.

The consistency in test administration – for example, the length of time given for the assessment, instructions given to students before the test.

The phrasing and terminology of the questions.

The suitability of the questions or tasks for the students being assessed.

The length of the assessment – a longer assessment generally produces more reliable results.There is always some random variation that may affect the assessment, so you should always be prepared to question results. No results, however, can be completely reliable. This puts you in a better position to make generalised statements about a student’s level of achievement, especially when you are using the results of an assessment to make decisions about teaching and learning, or reporting back to students and their parents or caregivers. Reliable assessment results will give you conﬁdence that repeated or equivalent assessments will provide consistent results. The validity of an assessment tool is the extent by which it measures what it was designed to measure. Checking how well these results correspond to common sense may help to learn whether they are valid.The reliability of an assessment tool is the extent to which it consistently and accurately measures learning. Specific techniques like test-retest help to calculate the correlation between the results of subsequent measurements and thus show whether these results are reliable. Do they produce correct results? Are they applicable for this subject? Both validity and reliability values make it possible to quickly evaluate how well your research approach works in a particular case. Why is it important to know the difference between reliability vs validity? Conducting complex research typically requires some preparation, particularly to evaluate your data collection and analysis methods.

A valid study measures what it is supposed to measure and its results can be applied to the population of interest. Validity means the accuracy or truthfulness of research findings.Research is considered reliable if it produces identical outcomes when repeated under similar conditions.

Reliability refers to the consistency of research findings over time or across different studies.Reliability and validity are two important concepts in research design that are used to assess the quality of research results.

What is reliability and validity