Understanding Diagnosis in User and Design Research
Diagnosis is a problem-solving approach that typically includes:
- Detecting symptoms
- Evaluating symptoms
- Identifying possible causes
- Recommending solutions
- Suggesting improvements
When discussing analytical thinking and diagnosis, Thomas Bayes is often referenced. His probability-based theorem is widely used to draw inferences in science and mathematics.
Bayesian Thinking
Bayes’ theorem helps estimate the likelihood of an event given prior evidence. In design, it supports informed assumptions—such as validating a hypothesis, diagnosing a usability issue, or predicting behavior based on observed patterns.
For example, consider a survey on color preference with equal male and female participants. If 60% of women and 30% of men prefer teal, the probability of a user choosing teal given they are female is 0.6.
Now imagine a webpage with two buttons—orange and teal—where only 5 out of 50 users click the orange one. The symptom is low engagement with the orange button. Possible explanations could include placement, user demographics, visual appeal, or labeling. By testing each hypothesis, the researcher can isolate the cause, refine the design, and iterate.
Diagnosis often relies on large datasets and can be efficient with the use of digital tools. However, identifying meaningful patterns requires strong analytical thinking.
Advantages of Diagnosis
1. Problem formulation through symptoms
Helps establish cause-effect relationships between design elements and user behavior.
2. Encourages critical thinking
Requires structured analysis to define the real problem.
3. Time-efficient
Scales well with large datasets, especially using online tools.
4. Tool-supported analysis
Data collection and pattern detection can be streamlined through digital platforms.
Challenges in Diagnosis
1. Depends on researcher expertise
Effectiveness improves with experience in analytical and Bayesian thinking.
2. Risk of misinterpretation
Incorrect evaluation of symptoms can lead to flawed conclusions and solutions.