Quant Methods
Qual Methods
Causality
100
Research that uses questionnaires to gather data from people.

Survey research 

100

Research that examines the stories of people about their lives and experiences

Narrative research

100

A type of causality that examines how changes in one variable (x) cause changes in another variable (y)

Variance theory of causation 

200

The use of a randomized control and treatment group

A "true" experiment

200

Research on a single or multiple person or site that uses multiple methods including interviews, observations, and documents.

Case study research

200

A type of causality that investigates how a variable (x) influences another variable (y) 

Causal process theory of causation

300

Studies of the association between two or more variables 

Correlational research (studies the correlation between two variables) 

300

Descriptive accounts of a person or setting that can use interviews, or observations to understand a phenomenona.

Basic interpretative studies (often basic interview studies).

300

Research methods appropriate for answering questions about causal variance 

Experimental and quasi-experimental research

400

Study of the effect of one variable(s) on another with systematic manipulation of the independent variable (treatment) on the dependent variable (outcome).

Experimental research

400
Research that uses archival records, documents, artifacts to arrive at conclusions about the past.

Historical research 

400

Research methods appropriate for answering investigations of causal process 

Qualitative research (e.g., case studies)