Here are some examples of data collection techniques: Case study: Observing an Alzheimer's patient over 6 months to document progression of symptoms. Observation: Watching children on a playground to record social behaviors. Questionnaire: Surveying students about study habits and stress levels. Psychological test: Administering an IQ test to applicants for a gifted program. Technology: Using an EEG to measure brain activity during a memory task. Cross-sectional: Comparing vocabulary scores across age groups from 5 to 15 years old. Longitudinal: Following the same group of students from kindergarten through high school to track academic achievement over time.