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wrong with face validity it is just the weakest criterion in arguing for the quality of a testing instrument as a predictor of future performance However, the diagnostic use of computer-based scenarios also entails serious dif culties that have yet to be overcome (1) The central question of appropriate approaches to the operationalization of problem solving quality remains largely unanswered (2) The reliability of the measurements obtained with some of the computerbased scenarios is less than satisfactory (see below) (3) The existence of a task-independent and thus generalizable problem solving ability has not yet been substantiated This indicates that the ability to steer the system is dependent not only on the skills of the problem solver, but evidently also on the nature of the task in question (4) The main problem is construct validity It is still unclear which skills are actually measured by means of the computer-based scenarios (see Su , Kersting, & Oberauer, 1992; Su , Oberauer, & Kersting, 1994) Either the measurement has to be interpreted as an indicator of an independent ability construct (as suggested by newly coined concepts such as networked thinking , heuristic competence , and operative intelligence ), or the scenarios are regarded as a new measurement method which, in a certain respect, is better able to measure established constructs such as intelligence than has previously been the case (eg in a more differentiated manner or with a higher level of acceptance) Beckmann and Guthke (1995) have summarized the European research dealing with the controversial relation between traditional measures of intelligence and problem solving skills (5) Evidence for the criterion validity of the measures used is also urgently needed
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Reliability
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Theoretically, it is to be expected that the reliability of scenario-based control performance measures will be lower than that of other performance measurements, eg intelligence tests, as problem solving scenarios provide more degree of freedom for the test taker and control performance is probably determined by heterogeneous factors Due to the dependence of each system state on the preceding ones, unintended sources of variance such as motivational uctuations or fatigue can build up, creating sequential dependencies in processing times The long duration of response times, as compared to intelligence tests, does not increase the reliability As a rule, each run of the simulation merely results in single act criteria (Fishbein & Ajzen, 1974) Psychometric results from simulation games yield in some cases estimates of different kinds of reliability To give some examples, Koller, Strau , and Sievers (1995) used three variants, all of which are based on a tailorshop scenario: Textile Production, Fuel Delivery, Coal Distribution As
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COMPUTER-BASED TESTING AND THE INTERNET
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dependent variable the number of periods with capital gains was used For Fuel and Coal scenarios the number of periods with capital gains correlated at r 0:69, for Textile with Fuel r 0:41 and for Textile with Coal r 0:44 Funke (1995) used a parallel version of a video recorder production scenario and found an r 0:83 As for internal consistency, Muller (1993) found r 0:83 to r 0:86 for two independent parts of a simulation game In contrast, the test retest reliability, which Muller based on a repeated test after 5 months, was r 0:53 and thereby clearly lower In the investigations by Su et al (1992, 1994), 137 test takers repeated the tailorshop after an interval of one year The retest stability was r 0:46 According to the reviewed studies, in certain scenarios at least some speci c measures satisfy the reliability requirements necessary for diagnostic use, in spite of unfavourable theoretical prerequisites (eg multiple performance conditionality, learning effects, and the low level of aggregation) Funke (1995, S 189 f) states that the reliability of performance on scenario-based problem solving tasks is on the same level as the reliability of so-called simulation oriented methods (such as group discussions) In general, performance on tasks such as these shows lower reliability than intelligence tests
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