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Principles of test cunstruction

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by

Karla Landaeta

on 24 October 2013

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Transcript of Principles of test cunstruction

Convergent Validity
Evidence that the test measures what it purports to measure.
Discriminant Validity
Evidence that the test does not measure irrelevant attributes.
Factors to consider when constructing a good test!
RELIABILITY
The extent to which a questionnaire, test,
observation or any measurement procedure
shows the same results on repeated trials.

PRACTICALITY
Refers to the economy of time, effort and money in testing.

Is it...?
- Easy to design
- Easy to administer
- Easy to mark
- Easy to interpret (the results)
VALIDITY
A test is valid "if it measures accurately what it is intended to measure" (hughes, A., 1989)

Usefulness of the test for a given purpose.

A valid test is always reliable!
Does the test measure what it is supposed to measure?
Validity of a test
A test with HIGH validity has items closely linked to what it (the test) is intended to assess.
A test with LOW validity does not measure what it ought to
BACKWASH
Harmful


Insecurity
Undesired
Mistrust
Beneficial


Confidence
Encourage
Trust
Reasons of Harmful Backwash
Innacurate tests
Lack of reliability
The need for tests

How to achieve a beneficial Backwash?
Test the abilities whose development you want to encourage
Make testing criterion-referenced
Base achievement tests on objectives
When is necessary, provide assistance to teachers

Types of Validity
Content Validity
Match between test items and the content or subject area the instrument is intended to assess.
Experts will review all of the items for readability, clarity and comprehensiveness and agree which items should be included in the final instrument.
Construct Validity
Seeks agreement between subject-matter theories and the specific measuring components of the test.
Requires the compilation of multiple sources of evidence.


Criterion Validity
Accuracy of a measure by comparing it with another process or method which has been demonstrated to be valid.
Face Validity
Review of test items does not require formal procedures.
Anyone can rate the validity of the test through informal opinion.
Types of Reliability
Equivalency
Two items measure identical concepts at an identical level of difficulty.
Stability

The agreement of measuring instruments over time.
To determine stability, a measure or test is repeated on the same subjects at a future date.
Internal consistency
(Homogeneity)

The extent to which items on the test or instrument are measuring the same thing.
Interrater
The extent to which two or more individuals (coders or raters) agree.
INSTITUTO PEDAGÓGICO DE CARACAS
UNIVERSIDAD PEDAGÓGICA EXPERIMENTAL LIBERTADOR
DEPARTAMENTO DE IDIOMAS MODERNOS
PROGRAMA INGLÉS
CÁTEDRA DE EVALUACIÓN
CURSO: EVALUACIÓN EN EL PROCESO DE ENSEÑANZA DEL INGLÉS COMO LENGUA EXTRANJERA










Caracas, January 2013
Elaborated by Angel E. Bello, Karla Landaeta and Javier Tapia.

Principles of test construction
Thanks!
The stability or consistency of scores over time or across raters.
Predictive Validity
Usefulness of test scores to predict future performance.

Admission tests
Concurrent Validity
Correlation between test scores and course grades
What's a test?
A method to determine a student’s ability to complete certain tasks or demonstrate mastery of a skill or knowledge of content.
References
Conclusions
Language testing. (2009) Available: http://eva.utpl.edu.ec/openutpl/ocw/mod/resource/view.php?id=2851 [Retrieved: 2013, October 21st]
College board. (2013) Validity evidence. Available: http://research.collegeboard.org/services/aces/validity/handbook/evidence [Retrieved: 2013, October 21st]
Magdalena, J. Validity, Reliability and Practicality (2010) Available: http://www.slideshare.net/Samcruz5/validity-reliability-practicality [Retrieved: 2013, October 22nd]
Keys to effective testing. (2012) Available: http://www.slideshare.net/VanzJustine/keys-to-effective-testing [Retrieved: 2013, October 22nd]
Cardozo, R., Magdalenga, J. Evaluación en el proceso de enseñanza del inglés como lengua extranjera (2011) Available: http://www.slideshare.net/Samcruz5/evaluacn-ile-introduction-to-the-course-preliminaries-7577959 [Retrieved: 2013, October 20th]
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