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Differential Diagnostic Questionnaire3

Differential Diagnostic Questionnaire Test

Understand which work areas fit your interests and strengths in about 5 minutes. Get a clear profile to guide career talks and next steps, based on 30 quick items.

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Questions: 305 minutes

08:30

October 2, 2025

October 2, 2025
Material has been updated

October 2, 2025
Material has been published

29,852 views

2,658 completions

2,216 likes

Verified by Daniel Hall

Psychologist with 25 years of experience

Scale Explorer

How the Scales are Structured

example score

7/12

Artistic Imagery (H) (AI)

Measures interest and inclination toward activities involving creating artistic images and engaging in creative arts.

Low

Moderate

High

0 – 5: Low | 6 – 8: Moderate | 9 – 12: High

A score of 7 falls in the Moderate range, suggesting a noticeable but not dominant interest in creative, art-related activities and professions.

example score

5/12

Sign System (Z) (SS)

Measures preference for working with sign systems such as numbers, texts, documents, and information systems in analytical, structured tasks.

Low

Moderate

High

0 – 5: Low | 6 – 9: Moderate | 10 – 12: High

A score of 5 falls in the Low range, suggesting a limited or situational interest in professions centered on structured information (e.g., numbers, texts, documents, systems).

example score

6/12

Technical Interests (T) (TI)

Measures interest and inclination toward technical work involving machinery, devices, and equipment maintenance.

Low

Moderate

High

0 – 5: Low | 6 – 8: Moderate | 9 – 12: High

A score of 6 falls in the Moderate range, suggesting a noticeable but not dominant interest in technical professions and working with equipment.

example score

5/12

Nature (N) (N)

Measures interest in professions involving living nature, such as working with plants and animals.

Low interest

Moderate interest

High interest

0 – 3: Low interest | 4 – 8: Moderate interest | 9 – 12: High interest

A score of 5 indicates a moderate interest in nature-related activities and roles involving plants or animals.

example score

6/12

People (P)

Measures inclination toward people-focused work that involves active social interaction and helping, teaching, guiding, or coordinating others.

Lower people-focus

Moderate people-focus

Higher people-focus

0 – 5: Lower people-focus | 6 – 8: Moderate people-focus | 9 – 12: Higher people-focus

A score of 6 indicates a moderate interest in working with people, suggesting comfort with social interaction in some roles while also valuing other activity areas.

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DATA-BASED USER COHORTS

Who Usually Takes This Test?

Teenagers choosing a path

46%OF USERS

Students who want a quick, clear idea of which professional areas match their interests before choosing courses or a future career.

Parents guiding decisions

31%OF USERS

Parents who want structured clues about their child’s strengths and preferences to support a realistic career conversation.

School counselors and teachers

23%OF USERS

Educators and career counselors who use a short questionnaire to start counseling sessions and plan next steps for students.

BASED ON AGGREGATED, ANONYMIZED DATA FROM TENS OF THOUSANDS OF FREUDLY USERS.

Benchmarking

See How You Compare

Once you complete the test, your results are compared with real-world data from people in your country.
Below is a preview of how scores are typically distributed across each scale.

Artistic image (AI) (Ai()

Average

7.8

Normal range

6.3 — 9.3

min.

max.

This curve shows how scores are typically distributed.
Once you complete the test, your result will appear on the scale so you can see how you compare.

Sign. system (S) (Ss()

Average

8.2

Normal range

6.4 — 10.1

min.

max.

This curve shows how scores are typically distributed.
Once you complete the test, your result will appear on the scale so you can see how you compare.

Technique (T) (T()

Average

4.9

Normal range

3 — 6.8

min.

max.

This curve shows how scores are typically distributed.
Once you complete the test, your result will appear on the scale so you can see how you compare.

Nature (N) (N()

Average

4.6

Normal range

3 — 6.1

min.

max.

This curve shows how scores are typically distributed.
Once you complete the test, your result will appear on the scale so you can see how you compare.

Person (P) (P()

Average

4.4

Normal range

2.7 — 6.1

min.

max.

This curve shows how scores are typically distributed.
Once you complete the test, your result will appear on the scale so you can see how you compare.

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SAMPLE QUESTIONS

Example Questions From the Test

Assume that, after appropriate training, you would be able to perform any job equally well. This questionnaire presents a list of different types of work. If you had to choose only one job from each pair in this list, which would you prefer? Select one type of work from each pair.

- Driving a car, bus, airplane, ship, or other vehicle
- Editing photographs using computer software
- Test computers before they are sold
- Process, analyze, and summarize sociological data
- Breed and train service dogs to detect drugs
- Assemble computers or equipment and set them up for use

These are 3 of the 30 real questions — the rest appear in the test. No sign-up needed to start.

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WHAT THE TEST MEASURES

About This Assessment

Differential Diagnostic Questionnaire, DDQ Test

Differential Diagnostic Questionnaire Test - Symptoms and Signs

career guidance

This brief self-report measure is intended to support rapid screening of vocational interests and preferred activity domains. The Differential Diagnostic Questionnaire helps clarify the types of tasks and work environments a respondent is more likely to find engaging or comfortable.

It consists of 30 items and typically takes about 5 minutes to complete. Responses are used to generate a profile of relative interest areas that can inform educational planning and career guidance discussions.

The Differential Diagnostic Questionnaire is best interpreted as an initial indicator rather than a standalone basis for high-stakes decisions. When used clinically or in counseling settings, results are most appropriate when integrated with interview data and other assessment information. (Robert L. Spitzer)

Author: Robert L. Spitzer

Literature: Holland, J. L. Making vocational choices: A theory of vocational personalities and work environments. Psychological Assessment Resources. 1997.; Anastasi, A., & Urbina, S. Psychological testing. Prentice Hall. 1997.

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