Instrument can be defined as a tool such as a questionnaire or a survey that measures specific items to gather quantitative data.
Demographic Forms are used to collect basic information such as age, gender, ethnicity, and annual income.
Performance Measures are used to assess or rate an individual’s ability such as achievement, intelligence, aptitude, or interests.
Attitudinal Measures are instruments used to measure an individual’s attitudes and opinions about a subject.
Behavioral Observation Checklist are used to record individuals’ behaviors and are mostly used when researchers want to measure an individual’s actual behavior.