The scale is reliable because it consistently reports the same weight every day, but it is not valid because it adds 3 kg to your true weight. For example, if your scale is off by 3 kg, it reads your weight every day with an excess of 3 kg. For a test to be reliable, it also needs to be valid. Validity refers to how well a test measures what it is purported to measure Why is it necessary? While reliability is necessary, it alone is not sufficient. Reliability is the degree to which an assessment tool produces stable and consistent results. Douglas, Language Assessment: Principles and classroom practices. Suggest ways to ensure reliability and validity in in language assessment. Distinguish the different types of validity and reliability in tests and other instruments in language assessment. TSL 3112 – LANGUAGE ASSESSMENT BASIC PRINCIPLES OF ASSSESSMENT RELIABILITY & VALIDITYĢ LECTURE’S OBJECTIVES Explain the difference between validity and reliability.
1 BASIC PRINCIPLES OF ASSSESSMENT RELIABILITY & VALIDITY
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