1. The document discusses principles of research design including control, balance, randomization, and replication. It also describes common experimental designs like completely randomized, paired, random block, and cross-over designs. 2. Survey design content includes purpose, population, sample size, observed unit, questionnaire, and data collection. Surveys are classified as overall, sampling, typical, case-control, or cohort. 3. Experimental designs aim to reliably estimate effects with minimal resources, while surveys either observe existing processes or are designed to collect sample data for statistical analysis and inference.