This document discusses data collection methods for research. It identifies the main types of data as tests scores, descriptions, conversations, or interviews. Common data collection procedures include observation, questionnaires, interviews, and tests. The document notes that the type of data collection depends on factors like the research design and problem. Procedures can vary in their degree of explicitness, from open and informal to highly structured. Developing good data collection requires converting variables into measurable units, selecting appropriate investigation procedures, piloting the instruments, and revising based on piloting. The key aspects are assuring reliability, validity, and quality of the data collection process.