What are case studies?

Case studies are a research method in psychology that involve in-depth investigations of a single unit, such as one individual or a small group or organisation. This approach allows researchers to explore complex behaviours, experiences, or conditions in great detail, providing insights that might not be possible through larger-scale studies. Case studies are particularly valuable when examining rare or unique phenomena, as they focus on real-life contexts and can reveal patterns or causes that contribute to psychological understanding.

Key features of case studies

Case studies have several distinctive characteristics that make them suitable for exploring individual differences and rare events.

Main characteristics

• Focus on a single unit - The study centres on one person, a small group, or an organisation, allowing for a detailed examination rather than general trends across many participants.
• Suitability for rare cases - They are ideal for investigating uncommon conditions or events, where gathering a large sample would be difficult or impossible.
• Longitudinal nature - Data collection often occurs over an extended period, tracking changes and developments in the subject's behaviour or condition over time. Longitudinal studies follow the same subjects repeatedly to observe how things evolve.
• Use of multiple data sources - Information comes not just from the main participant but also from family, friends, and official records, such as school reports, medical histories, or workplace documents.
• Structure of reports - Case study reports typically start with a case history, which is a background summary of the subject's life, experiences, and relevant events leading up to the study.

Data collection techniques

Case studies gather data through various methods to ensure a well-rounded analysis. This often involves triangulation, where multiple techniques are combined to cross-verify findings and increase accuracy.

Methods used in case studies:

• Interviews - Structured or unstructured conversations with the participant or others to gather personal accounts and insights.
• Observations - Direct watching and recording of the subject's behaviour in natural or controlled settings.
• Psychometric tests - Standardised assessments that measure psychological variables, such as intelligence or personality traits.
• Qualitative and quantitative data - Qualitative data includes descriptive information like narratives or opinions, while quantitative data involves numerical measurements that can be statistically analysed.

By using these techniques, case studies provide rich, detailed information that can reveal underlying psychological processes.

Example case study: Saavedra and Silverman on button phobia

This case study illustrates how the method is applied in clinical psychology. It focuses on a rare phobia and demonstrates the use of treatment alongside data collection.

Participants

A nine-year-old Hispanic-American boy with a specific phobia of buttons, with additional input from his mother through interviews.

Method

The researchers used a clinical case study approach, combining exposure-based cognitive-behavioural therapy (CBT) with interviews. Data was gathered over time to document the boy's phobia and treatment progress.

Procedure

• Initial interviews with the boy and his mother to understand the origins and severity of the button phobia.
• Application of exposure therapy, where the boy was gradually exposed to buttons in a controlled way to reduce fear.
• Follow-up assessments to evaluate changes in behaviour and anxiety levels.

Results

• The treatment successfully reduced the boy's phobia, with decreased avoidance of buttons and improved daily functioning.
• Insights revealed how disgust and fear intertwined in the phobia, providing a deeper understanding of specific phobias in children.

Conclusions

• Exposure-based CBT can be effective for rare phobias in young people, highlighting the role of emotional responses like disgust.
• This case contributed to knowledge on phobia treatment, showing how individual factors influence outcomes.

Evaluation

• Strengths - Provided detailed, real-world insights into a rare condition; triangulation through therapy and interviews enhanced validity.
• Limitations - As a single case, findings may not generalise to others; potential researcher bias from close involvement with the participant.

Evaluating case studies

Like all research methods, case studies have advantages and drawbacks that affect their usefulness in psychology.

Strengths of case studies

• High validity through detail - They offer rich, in-depth information that provides genuine insight into an individual's psychological experiences, capturing nuances that broader studies might miss.
• Reduced bias via triangulation - Combining multiple data collection methods, such as interviews and observations, helps cross-check information and increases the overall validity of the findings.

Weaknesses of case studies

• Potential for researcher bias - Researchers often work closely with participants over time, which can lead to less objectivity and influence how data is interpreted.
• Low reliability - Due to their focus on unique individuals or small groups, case studies are hard to replicate exactly, making it difficult to test consistency across different cases.

Overall, case studies excel in exploring rare phenomena but require careful consideration of bias and generalisability when drawing broader conclusions.