Psychological assessment
Personality assessment: objective and projective methods
What personality is, whether it is stable, objective inventories, projective techniques and the evidence debate.
What this module draws on:
- Textbook concept Personality concepts, objective and projective testing, controversies (Ch. 8).
- Contemporary update Current editions; evidence debates.
- Original elaboration Comparison activity.
Learning objectives
After this module you should be able to:
- Define personality and discuss the person–situation debate.
- Contrast objective and projective methods.
- Describe the role of validity scales.
- Evaluate the evidence for projective techniques.
Introduction
Personality assessment seeks to describe enduring patterns of thinking, feeling and behaving — and, clinically, problems in psychological functioning. The textbook divides methods into objective tests (structured items with fixed responses) and projective tests (ambiguous stimuli with free responses).
Is personality stable? Textbook concept
Traditionally, personality was assumed to be consistent across time and situations. Research, including the person–situation debate, showed that behaviour depends partly on circumstances. A contemporary view is that people show stable tendencies that interact with situations.
Objective and projective methods Textbook concept
| Feature | Objective (e.g., MMPI, MCMI, 16PF) | Projective (e.g., Rorschach, TAT, sentence completion, drawings) |
|---|---|---|
| Stimulus | Specific statements | Ambiguous images, stems or tasks |
| Response | Fixed choices (true/false, ratings) | Free, open responses |
| Scoring | Standardised, often computerised, against norms | Coding systems requiring extensive training |
| Strengths | Reliability; norms; validity scales | Rich material; harder to fake deliberately in some respects |
| Concerns | Response styles; reading level; cultural norms | Reliability and validity of many interpretations are contested |
Validity scales Original elaboration
Many objective inventories include scales that flag inconsistent responding, over-reporting or under-reporting. They improve interpretation but do not prove honesty or dishonesty; they prompt further inquiry.
The projective debate Textbook concept
The textbook notes that many reviews have questioned the reliability and validity of projective techniques. More recent scoring systems have improved standardisation, and evidence varies by variable — some indices show validity for specific purposes, while many popular interpretations do not. Clinicians should know which inferences are supported.
Worked example: Over-interpretation Original, fictional
A fictional trainee concludes from a single story told to a picture card that a client 'has unresolved hostility toward his father'. A supervisor asks what other evidence supports this, whether the inference has demonstrated validity, and whether the story might reflect the card's content, recent events or cultural storytelling conventions. One response is a hypothesis to test, not a finding.
Interactive activity
Objective or projective?
Match each fictional description to the correct category or concept.
Show the answer key
- Responding true or false to hundreds of statements → Objective inventory
- Telling stories about ambiguous pictures → Projective technique
- A scale flagging random or inconsistent answering → Validity scale
- Completing 'My mother…' with the first thought → Sentence completion
Knowledge check
4 questions. Every option has an explanation. Your answers are not sent anywhere when JavaScript is available; without it, they are checked by the server and immediately discarded.
Summary
- Personality involves stable tendencies interacting with situations.
- Objective tests offer standardisation and norms; projective tests offer rich material but contested validity.
- Validity scales assist interpretation without proving honesty.
- Use only inferences with supporting evidence; respect test security.
Questions for reflection
- Why might a client from a collectivist culture respond differently to personality items written in an individualistic culture?
Key terms
Further reading
- Textbook Plante, T. G. (2005). Contemporary clinical psychology (2nd ed.). John Wiley & Sons.
- Further reading Groth-Marnat, G., & Wright, A. J. Handbook of psychological assessment (latest edition). Wiley.
- Official University of Minnesota. New release of world-standard psych test for today's population (MMPI-3). Official link (opens in a new tab)
Practise in the case lab: Daniel: intrusive thoughts and hours of washing