1.
PROBABILITY
1.1.
SIMPLE RANDOM
1.2.
SYSTEMATIC RANDOM
1.3.
STRATIFIED RANDOM
1.4.
CLUSTER RANDOM
2. NON-PROBABILITY
2.1. QUOTA
SAMPLING
2.2.
SNOWBALL SAMPLING
2.3.
INCIDENTAL OR CONVENIENCE
SAMPLING
2.4.
DIMENSIONAL SAMPLING
2.5.
PURPOSIVE
2.6.
KEY INFORMANT