Reliability in assessment refers to the consistency, stability, and dependability of measurement tools and procedures used to evaluate individuals' knowledge, skills, or attributes. It is a crucial aspect of assessment, ensuring that the results obtained are accurate, reproducible, and free from random error. A reliable assessment instrument consistently yields similar results when administered under consistent conditions, allowing for trustworthy and meaningful interpretations. There are several key facets of reliability in assessment: 1. **Test-Retest Reliability:** This aspect assesses the consistency of results when the same test is administered to the same group of individuals on two separate occasions. A highly reliable assessment will produce similar scores each time the test is taken, assuming that no significant changes have occurred in the participants' knowledge or abilities. 2. Internal Consistency Reliability: This dimension evaluates the degree of consistency among different items within the same test. High internal consistency indicates that all items are measuring the same underlying construct, providing a reliable overall score. 3. Inter-Rater Reliability: When assessments involve subjective judgment or scoring, inter-rater reliability ensures consistency among different raters or evaluators. It measures the agreement between different individuals scoring the same responses or performances. 4. Parallel Forms Reliability: This form of reliability involves the use of two different but equivalent versions of a test to assess consistency in measurement. If both forms yield similar results, it suggests that the assessment is reliable across different sets of items. Reliability is fundamental for drawing meaningful conclusions from assessments, as it ensures that the obtained scores accurately reflect the participants' true abilities or characteristics rather than random fluctuations or errors. A reliable assessment provides a solid foundation for decision-making in various fields, including education, psychology, employment, and healthcare. Researchers, educators, and practitioners prioritize reliability to enhance the validity and credibility of assessment outcomes, ultimately leading to more informed and accurate evaluations.

1. Presentation
Course: Classroom Assessment
Bechlours in Education (B Ed)
Reliability

2. Reliability is the degree to which an assessment tool
produces stable and consistent results.
Reliability Consistency

3. measure is considered reliable if it gives us the same
results over and over again.
different environments can affect the result.
Accurate interpretation and decision-making.

4. Accuracy
3 qualities for good reliability
Consistency
Dependability

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It measures reliability.
TEST-RETEST RELIABILITY
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The same test is taken twice from the same group
of individuals over a period of time.
After both tests results will be compared to check
whether both results are correlated or not.
It checks the consistency of scores
Process:

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An IQ test is taken from a group of students. The
same IQ test will be taken again from the same
group of students after a week.
CONDITION: there should be NO INTERVENTION
EXAMPLE:
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7. It is used to assess the consistency of the
results of two tests constructed in the same
way from the same content domain.
we measure the correlation between two
equivalent versions of a test.
Parallel forms Reliability:

8. Different versions of a test are designed to
be equivalent.
The same number of items/questions.
Same difficulty level.
EXAMPLE:
Surveys
Writing

9. Inter-Rater Relaibility:
It is a statistical measure that assesses the reliability and
consistency of the assessment process by comparing the
ratings or scores assigned by different assessors.
It is crucial in assessment as it helps ensure that the
assessment process is objective, fair, and consistent
across different assessors or raters.

10. Portfolio Assessment of Student Artwork
In an art class, students are required to compile a
portfolio showcasing their artwork created
throughout the year.
Multiple art teachers are assigned to evaluate the
portfolios using a set of predetermined criteria.
The scores assigned by the assessors are then
compared to determine the level of reliability.
Example:

11. It is the type of Reliability which used to Evaluate the
degree of Assessment through different questions asking
about the same Skill and producing Similar results.
It is used to determine the validity of Similar items on a
test.
Internal Consistency reliability

12. My Favorite Personality
My School.
The student should give the same answer to both.
Two questions on Essay writing:
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If s/he knows what is the suitable structure for writing an
essay (Introduction, Body, Conclusion), s/he will get both
questions right.
Example:

13. References:
https://youtu.be/L9wgWUMo8DQ
https://conjointly.com/kb/types-of-reliability/
https://youtu.be/OlUVKvjMUFc

14. Thank
you