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Selecting and Applying Personality Assessment Techniques
Psychology of Personality · Chapter 2: Methods and Ethics in Personality ResearchSection 2.10 · lesson 15 of 838 min · free with a free account
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The best instrument is the one validated for this purpose, not the most respected one.
- Name the factors that should drive instrument selection
- Explain why constraints can outweigh sophistication
- Match assessment method to context
- Act correctly when independent methods disagree
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Methods and Ethics in Personality Research
Selecting and Applying Personality Assessment Techniques
There is a reliable way to choose the wrong assessment instrument. Pick the one with the best reputation, and worry about fit afterwards. This section is about the order those two considerations should come in. We will look at what should actually drive selection. Why practical constraints can outweigh theoretical sophistication. How context changes the priorities entirely. And what a careful assessor does when two independent methods disagree.
Start Here
Three Questions Before Any Instrument
Choosing an assessment technique begins with three questions, and none of them is about the instrument. First, what is the purpose of the assessment? What question is it being asked to answer? Second, who is the population involved? Third, what decisions will the results inform? That third question sets how much evidence the instrument has to carry. A screening result that leads to a conversation is one thing. A result that leads to a hiring rejection is another. And the answer follows from those three. The most defensible choice is the instrument with documented evidence of suitability. For that specific purpose, and that specific group. Not the instrument with the strongest reputation in the field generally.
Different Demands
The Same Test Is Not Equally Good Everywhere
A clinical diagnosis, a hiring screen, and a research study are not the same task. They impose different demands on reliability, validity, time and cost. And those four trade against one another constantly. A research study can tolerate a two-hour instrument that a hiring process cannot. A hiring process must clear a fairness bar that a study does not face in the same form. So a technique is never simply good or bad in isolation. It is suited, or unsuited, to a particular use. Which means the use has to be specified before the judgement can even be made. Asking whether a test is good is not yet a well-formed question.
The Sequence
How the Choice Actually Gets Made
The selection process has a shape, and it runs in this order. Purpose. What question is being answered. Population. Who is being assessed, and which norms therefore apply. Decision. What follows from the result once it exists. Feasibility. Time, cost, training, and language. And finally, documented fit. Evidence of suitability for this specific use. Notice that the instrument is chosen last, not first. Reversing that order is the most common way this goes wrong. Because a chosen instrument tends to redefine the question to suit itself.
Constraints
Four Things That Decide What Is Even Possible
Practical constraints also shape selection, and they are not minor. Administration time. The examiner training required to use the instrument properly. Language and cultural appropriateness. And the availability of relevant norms. It is tempting to treat these as compromises, to be apologised for in a limitations section. They are not. An instrument that cannot be administered properly in the conditions available. Will not produce valid scores. Feasibility is part of validity, in practice if not in theory.
The Rule
Prestige Is Not Evidence
Which leads to a rule that people find uncomfortable. A theoretically excellent instrument that lacks norms for the population at hand. May be a poorer choice than a simpler tool that has been properly validated for that group. The reason is straightforward once stated. Without appropriate norms, a score has nothing meaningful to be compared against. A precise number, referenced to the wrong population, is not precision. This is where professional judgement most often bends. The prestigious instrument is easier to defend socially. And harder to defend evidentially. Suitability, not reputation, determines defensible results.
By Context
What Each Setting Prioritises
Different contexts call for different combinations of methods. Clinical settings prioritise diagnostic accuracy. Typically pairing a structured interview with self-report and informant data. Organisational settings emphasise fairness and job relevance. Using validated work measures. Research settings prioritise psychometric strength, with instruments fitted to the hypothesis. Educational settings need appropriate norms, and therefore norm-referenced tools. And forensic settings prioritise defensibility above all. Which means multimethod work, thoroughly documented. Matching method to context strengthens the usefulness of the conclusions. And, just as importantly, their defensibility afterwards.
Triangulate
Independent Sources, Not More of the Same
Across all of these contexts, one principle holds. Multimethod assessment improves accuracy. By triangulating evidence from independent sources. The word independent is carrying the entire argument there. Three self-report inventories are not three sources. They share the same channel, and therefore the same vulnerabilities. Self-presentation among them. Adding a fourth questionnaire increases the volume of evidence, and not its independence.
Reading Results
Agreement Is Confidence, Disagreement Is Information
Once you have several independent methods, their agreement becomes informative. Convergence among methods increases confidence. Independent routes arriving at the same place is evidence about the person. Rather than evidence about any one instrument. Divergence flags the need for caution, and for further inquiry. It is not a result to be averaged away into a tidy summary. It is a signal that something has not yet been understood. The temptation, when methods disagree, is to pick the source you trust more. And to move on with a clean answer. That converts a genuine finding about uncertainty. Into a false finding about the person.
Reporting
Say What the Technique Can Support
Application also includes how results are communicated. Appropriately to the audience receiving them. A clinician, a manager, and a court need different framings of the same finding. And it includes respecting the boundaries of what each technique can legitimately support. Every instrument has a range of claims it is able to carry. Stating a conclusion outside that range is a reporting failure. Even when the score itself was perfectly accurate. The error is in the sentence, not in the number.
Consolidate
The Prestigious Test That Was Wrong for the Child
Close with a decision made well. A school psychologist needs a quick, well-normed screen for a young student. One available instrument is longer, more prestigious, and normed on adults. She chooses the validated brief inventory instead. Because the longer instrument, despite its prestige, lacks appropriate norms for children. Its sophistication cannot substitute for comparison data it does not have. That single decision contains the whole section. The best technique is not the most sophisticated one available. It is the one with documented validity for this purpose, this population, and this decision. Used within a multimethod design that can be checked afterwards.
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