Research methods

Research Methods in Developmental Psychology

Scientific approaches used to study how children grow, think, and behave over time.

Three Main Types of Research

Descriptive, correlational, and experimental.

Descriptive Research

Methods used to describe behavior without determining relationships or causation

Correlational Research

Examines relationships between two measured variables; used to predict but NOT determine causation.

Experimental Research

Research that allows cause-and-effect conclusions by manipulating variables.

Scientific Research Process

Theory → Research Question → Research Design → Hypothesis → Data → Data supports or contradicts hypothesis.

Types of Descriptive Methods

Naturalistic observation, structured observation, interviews, questionnaires.

Naturalistic Observation

Observing behavior in real-world settings (“in the wild”) without interference.

Naturalistic Observation – Strengths

Real-world behavior, detailed information, easy to conduct.

Naturalistic Observation – Weaknesses

Observer bias and difficulty capturing rare behaviors.

Examples of Naturalistic Observation

• Children’s outdoor play

• Family conversations at mealtime

• Cooperation in sports teams

Structured Observation

Observing behavior in a controlled/arranged environment where all participants experience the same situation.

Structured Observation – Purpose

To create identical opportunities to compare behavior across children.

Structured Observation Example

Creating a situation to test impulse control (e.g., temptation tasks).

Structured Observation – Strengths

Allows direct comparisons between participants.

Structured Observation – Weaknesses

Can feel artificial or contrived (less natural behavior).

Interviews

sking participants questions directly to gather information (self-report or caregiver report

Questionnaires

Written forms where participants or caregivers report behaviors or thoughts.

Interviews & Questionnaires – Strengths

Cost-effective and efficient way to gather large amounts of data.

Interviews & Questionnaires – Weaknesses

Accuracy issues and social desirability bias (people may give “acceptable” answers).

Structured vs. Clinical Interview

• Structured: standardized questions

• Clinical: flexible, open-ended questioning

Informants

People who report on a child’s behavior (e.g., parents, teachers).

Piaget Clinical Interview Example

A 6-year-old explains the sun was made by lighting a match in the sky—demonstrates children’s reasoning and understanding of the world.

Purpose of Piaget’s Method

To understand how children think, not just what they know.

Correlation

A relationship between two variables.

Positive Correlation

Two variables increase together (bottom-left to top-right pattern).

Negative Correlation

One variable increases while the other decreases (top-left to bottom-right pattern).

Correlational Research Limitation

Cannot establish causation.

Direction-of-Causation Problem

It’s unclear which variable causes the other.

Third-Variable Problem

A separate variable may explain the relationship between two variables.

Key Warning About Correlations

Just because a relationship “makes sense” does NOT mean it is causal—stay critical.

Experimental Research Goal

Determine cause-and-effect relationships.

What Correlational Research Is Missing

Ability to determine causation.

Role of Descriptive Research

Provides the data used in correlational studies.