Solution
Data collection is gathering relevant information for a purpose. The method depends on the research objective and the type of data required. Common methods are surveys, observations, and experiments.
Surveys: A predefined set of questions is given to a sample, using online forms, telephone, or face-to-face interviews. They collect large amounts of structured data. Example: a grocery store in Islamabad asks customers five questions about products, shopping frequency, and what influences purchases, then stocks according to demand.
Observations: Data is collected by watching subjects in their natural environment, without interference. Example: a restaurant watches which tables customers choose at lunch for a week, then rearranges seating for comfort and traffic flow.
Experiments: One or more variables are changed to see the effect on another variable, often in a controlled setting. Example: one group of students receives printed notes and another relies on lectures; after one month both take the same test to see whether notes improved performance.
After collection, data must be prepared (cleaned, organized, and transformed) so analysis is reliable.