Teaching English as a Foreign Language, Second Edition
Subjective and objective testing
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Subjective and objective testing
There is another pair of terms used in connection with assessment—one of them was used in the last sentence— which also need to be clarified. These are the terms subjective and objective. There is often talk of objective tests. It is important to note that these words refer only to the mode by which the test is marked, there is nothing intrinsically objective about any test or test item. The understanding is that objective tests are those which can be marked almost entirely mechanically, by an intelligent automaton or even a Assessment and Examinations 147 machine. The answers are usually recorded non-linguistically, by a tick or a cross in a box, a circle round a number or letter, or the writing of a letter or number. Occasionally an actual word or punctuation mark may be used. Typically such tests take the multiple-choice format or a blank-filling format but no real linguistic judgment is required of the marker. Subjective tests on the other hand can only be marked by human beings with the necessary linguistic knowledge, skill and judgment. Usually the minimum requirement for an answer is a complete sentence, though sometimes single words may be sufficient. It must be recognised, however, that the creation and setting of both kinds is ultimately subjective, since the choice of items, their relative prominence in the test and so on are matters of the knowledge, skill and judgment of the setter. Furthermore, evaluating a piece of language like a free composition is virtually an entirely subjective matter, a question of individual judgment, and quasi-analytic procedures like allocating so many marks for spelling, so many for grammar, so many for ‘expression’ and so on do almost nothing to reduce that fundamental subjectivity. A checklist of points to watch may help to make the marking more consistent but it is well to recognise that the marking is none the less subjective. It is frequently claimed that the results obtained from objective tests are ‘better’ than those obtained from subjectively marked tests or examinations, and books like the classic The Marking of English Essays by P.Hartog et al. with their frightening picture of the unreliability and inconsistency of marking in public examinations give good grounds for this claim. However, there are two devices which may be used to improve the consistency and reliability of subjective marking. One is to use the Nine Pile Technique and the other is to use multiple marking. The Nine Pile Technique is based on the assumption that in any population the likelihood is that the distribution of abilities will follow a normal curve, and that subjective judgments are more reliable over scales with few points on them than over scales with a large number of points on them. In other words a five-point scale will give reasonable results, a fifty-point scale will not. Suppose a teacher has ninetynine essays to mark. He will begin by reading these through Assessment and Examinations 148 quickly and sorting them into three piles on the basis of a straight global subjective evaluation: Good, Middling, Poor. In order to get an approximately normal distribution he would expect about seventeen of the ninety-nine to be Good, sixty-five to be Middling, and seventeen to be Poor. Next he takes the Good pile and sorts these on the basis of a second reading into Outstanding, Very Good, and Good piles. In the Outstanding pile he might put only one essay, in the Very Good pile four, and the remaining twelve in the Good pile. Similarly he would sort the Poor pile into Appalling, Very Poor, and Poor with approximately the same numbers. Finally he would sort the Middling pile into three, Middling/ Good, Middling, and Middling/Bad in the proportion of about twenty, twenty-five, and twenty. This sorting gives a ninepoint scale which has been arrived at by a double marking involving an element of overlap. Obviously if the second reading requires a Middling/Bad essay to go into the Poor pile or a Poor essay to go into the Middling Pile such adjustments can easily be made. This technique has been shown to give good consistency as between different markers and the same marker over time. If this technique is then combined with multiple marking, that is to say getting a second or third marker to re-read the essays and to make adjustments between piles, the results are likely to be even more consistent and reliable. There is a very cogently argued case for multiple marking made out in Multiple Marking of English Compositions by J.Britton et al. Techniques such as these acknowledge the fundamentally subjective nature of the assessments being made, but they exploit the psychological realities of judgementmaking in a controlled way and this is surely sensible and useful. The time required for multiple marking is no greater than that required for using a conventional analytic mark allocation system and there seems little justification for clinging to the well worn and substantially discredited ways. All of the above is almost by way of being preliminary. When the fundamentals of what assessing progress in learning a foreign language really involves are considered it becomes clearly apparent that it is the underlying theoretical view of what language is and how it works that is most important. |
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