In one line: Before you can study 'stress' or 'memory', you have to decide exactly how you will measure it.
Psychology studies things you cannot see directly — stress, memory, attention, happiness. Measurement is the concept of pinning these fuzzy ideas down so they can be recorded and compared.
The key move is operationalisation. 'Stress' becomes score on a 20-item stress questionnaire; 'memory' becomes number of words recalled in two minutes. The idea is now countable.
Memory hook: No definition of how to measure it, no data. Operationalise first, then measure.
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Key idea: Behaviour can be measured as numbers or as descriptions, and gathered by asking people or by watching them.
Two ways to gather it
Self-report
Ask people directly — questionnaires, rating scales, interviews. Good for feelings, but people may not be honest or accurate.
Observation
Watch and record what people actually do. Good for real behaviour, but you cannot see thoughts or feelings.
Ask them · Watch them
Take a study of exam stress. Operationalise: stress = score on a standard anxiety scale. Quantitative self-report: students rate their stress 1–10. Observation: a researcher also counts fidgeting during a mock exam. Two measures of the same idea.
Go further — higher-level insight: Using more than one measure is a strength. If a questionnaire (self-report) and an observation both point the same way, you can trust the finding more. Relying on a single measure is a common weakness to point out in an evaluation.
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How this is tested: Measurement underpins every study. A favourite prompt: 'explain how you would measure [some behaviour]'. Name the operational definition, say whether it is self-report or observation, and note one limitation.
As a researcher, explain how you would measure how much a new app improves young children's focus during homework.
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Common mistakes: 1. No operational definition. Say exactly what you would count or score.
2. Confusing the measure with the concept. A questionnaire score is a measure of stress, not stress itself.
3. Ignoring limitations. Every measure misses something — name one.