PILOT STUDIES & BLIND PROCEDURES

PILOT STUDY

→ small-scale trial run of the actual investigation

→ helpful to test out questionnaire or interview questions

→ useful for training observers in observational studies

SINGLE-BLIND PROCEDURE

→ when the aim of the study is kept from participants

DOUBLE-BLIND PROCEDURE

→ when neither the participants nor the researcher who conducts the study is aware of the aims of the study