Types of experiment

• laboratory
• field 
• natural
• quasi

Types of observation

• naturalistic
• controlled
• covert
• overt
• participant
• non-participant

Self-report techniques

• Questionnaires
• Interviews
  • Structured
  • Unstructured

Correlations

• Analysis of the relationship between co-variables
• The difference between correlations and experiments.

Content analysis

Case studies