Vienna Test System: IBF


Summary of Test Review

General description of Test


Test Review Summary

Test Name:Vienna Test System: IBF
Authors of Original Test: Franz Blum
Hans-Jorg Didi
Ernst Fay
Ulla Mauchle
Gunter Trost
J-H Wahlen of the ITB Institut fur Test- und Begabungsforschung GmbH
and George Gittler
Institute of the University of Vienna
Local test distributor / publisher:Schuhfried
Date of Current Review:April 2009
Date of Publication of Current Review / Edition:06 May 2009
Type of Test:General Ability
Verbal Ability
Numerical Ability
Spatial Ability
Main Area of Use:Psycho-clinical
Work and Occupational
Counselling, Advice, Guidance, and Career Choice
Constructs Measured:Four subtest scales:

- Verbal intelligence: assesses the understanding of words and their meaning using sentence completion and verbal analogy items.
- Numerical intelligence: assesses ability to analyse numerical problems and to deduce and apply general mathematical rules using completion of number sequences and problem-solving items.
- Long-term memory: assesses retention and select recall of verbal and numerical material over time.
- Visualisation: assesses mental rotation of three-dimensional objects.

Global variable:

- General intelligence: a composite factor score from the factor scores from the four subtests.
Administration Mode:Computerised locally-installed application - supervised/proctored
Response Mode:Computerised
General Description of Test:The Vienna Test System is a computerised collection of tests and assessments that can be used alone or combined as batteries of tests. The system contains some 74 instruments covering work, health and education and categorised as Intelligence, General Ability, Special Ability, Personality Structure, Attitude and Interests and Clinical tests. Many of the tests are multi-lingual with the majority being in German and English. Those tests that are produced in the English Language and have not been reviewed elsewhere are reviewed here as individual tests. The Basic Intelligence Functions Test (IBF) is designed to provide an assessment of the intelligence level of test-takers aged 13 years – 77 years based upon four subtests corresponding to the following ability dimensions from Thurstone’s (1938) primary factors of intelligence: verbal intelligence (35 items), numerical intelligence (40 items), visualisation (figural-spatial intelligence) (17 items) and memory (20 items). The authors assume a hierarchical model of intelligence and combine scores on these four subtests into a composite, General Intelligence, with an IQ range of 55-145.The test is designed both as a screening tool to provide a measure of intelligence and as a means of providing a profile of performance across these four areas of ability. The intended areas of application are within education, career choice, aptitude assessment and within the practice of psychology. There are two forms of the IBF: S1, the ‘Standard Form’, which takes between 45-65 minutes and S2, the ‘Short’ Form, which takes between 30-45 minutes. The assessment is timed and the time limit for completing each section is made clear to the test taker before each section begins. Worked examples are used to help test takers to understand the nature and requirements of each test. Responses can be made using the computer keyboard or mouse or using an optional light pen or subject response panel, available from the distributors. While three of the tests could be taken separately it is recommended that all four subtests of the IBF should be taken together. The results are scored by the software and are calculated as factor scores and reported as raw scores, z- scores, percentiles and T-scores and IQ scores with associated confidence intervals for verbal intelligence, numerical intelligence, visualisation and memory and overall general intelligence, with the latter based upon a structural equation model. The report form also provides information regarding responses to individual items (e.g. correct, incorrect, amended, omitted, time taken for each item) and how much time overall was taken for completion of the test.


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