1.2 What types of data and evidence do sociologists use?

2026 Syllabus Objectives

By the end of this subtopic, you should be able to:

1.2.1 Sources of data:

  • Understand the differences between primary and secondary sources of data
  • Understand the differences between qualitative and quantitative data
  • Evaluate the strengths and limitations of each type of data

1.2.2 Secondary evidence:

  • Identify and describe examples of official statistics
  • Identify and describe examples of historical and personal documents
  • Identify and describe examples of digital sources
  • Identify and describe examples of media content
  • Evaluate the strengths and limitations of each type of evidence

1.2.3 Analysis, interpretation and evaluation of data:

  • Analyze and interpret summaries of sociological studies
  • Analyze and interpret data from diagrams
  • Analyze and interpret data from tables
  • Analyze and interpret data from charts
  • Analyze and interpret data from graphs

Primary and Secondary Sources of Data

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🔑 Key Definitions

Primary data are data collected by the researcher themselves using methods such as questionnaires, interviews or observations.

Secondary data are data that already exist, having previously been gathered by an earlier researcher or organisation (at which time they were primary data).

Understanding the Difference

In most research projects, sociologists follow a systematic approach:

  1. First: Study all published research on the topic under investigation (secondary data)
  2. Then: Carry out research that produces new primary data
  3. Result: Add to knowledge on the topic and support or question the secondary data

Four Main Types of Secondary Data

Sociologists use four main types of secondary data:

  • Official statistics produced by government or official organisations
  • Research by other sociologists, journalists and the government
  • The media including television, radio, internet, newspapers and magazines
  • Other sources mainly of qualitative data, such as diaries, letters and photographs

⚡ Strengths and Limitations

Strengths of Primary Data

  • Researcher control: The researcher knows exactly how valid and reliable the data is
  • Purpose-designed: Research is designed for the exact purpose needed
  • Currency: Data are likely to be up to date

Limitations of Primary Data

  • Bias concerns: Affected by interviewer bias and researcher imposition
  • Resource-intensive: Costly and time-consuming to collect

Strengths of Secondary Data

  • Accessibility: Easily accessible
  • Breadth: Vast amounts of information available
  • Knowledge base: Contains accumulated knowledge from previous research
  • Practicality: Useful when primary research is difficult (e.g., studying crime)

Limitations of Secondary Data

  • Outdated information: May be out of date
  • Relevance issues: Difficult to decide relevance to current research
  • Methodological concerns: Lack of information on sample sizes
  • Interpretation filters: Data interpreted by others
  • Purpose bias: Collected for a specific purpose, may be biased

Important Note: When deciding whether to use primary or secondary data, consider the research question. For example, if researching employment in different industries in your country or local area, secondary data (like official government statistics) would likely be better as it is already collected on a large scale, though primary data could provide specific local insights.

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