The document summarizes a class discussion on data collection. It defines primary and secondary data, with primary data being original data collected for a specific purpose, and secondary data being previously collected data from other sources. Methods of collecting primary data include direct investigation, oral investigations, local agencies, mailed questionnaires, and enumerators. Sources of secondary data include both published sources like censuses and government reports, as well as unpublished sources.

1. LAST CLASS DISCUSSION:
• Meaning of Collection of Data
• Pre-Requisites for Data Collection (7 steps)- (Physical Class)
• Meaning of Primary and Secondary Data (Online Session)
• Method of Collection of Primary Data (VVI) (Online Session)
• Sources/Method of Collection of Secondary Data(VVI)
• Census Method/ Sampling Method (VVI)

2. PRIMARY AND SECONDARY DATA
• Introduction
The data may or may not have been published. They may have been collected
by an individual, a business firm, a research organization, a trade association,
a local state, or government office, a newspaper or magazine and so forth.
There are two types of data, primary and secondary
data.
1. Primary Data
2 Secondary Data

3. DIFFERENCES BETWEEN PRIMARY AND
SECONDARY DATA (VVI)

4. METHODS OF COLLECTION OF PRIMARY
DATA (VVI)
1. Direct Personal Investigation
2. Indirect Oral Investigations
3. Information Received Through Local Agencies
4. Mailed Questionnaire method
5. Schedules Sent through enumerators

10. METHOD/SOURCES OF SECONDARY DATA
(VVI)
1. Published Sources
2. Unpublished Sources

24. See you tomorrow with
new chapter- Measure of
Dispersion
THANK YOU!