1. Water Pollution Investigation | Fieldwork on pollution in Vietnam’s rivers and lakes; visual pollution survey, data collection, and analysis. 2. Pollution & Land Use | Assessing pollution variation based on land use; measuring pH levels in different locations; evaluating hypothesis validity. 3. Fieldwork Techniques & Reliability | Methods to improve data reliability, using digital meters, systematic sampling, and structured surveys. 4. Development Indicators in Nigeria | Investigating infant mortality causes, literacy rates, and access to healthcare through surveys. 5. Data Representation & Analysis | Constructing bar graphs, pie charts, and statistical summaries to interpret survey results. 6. Comparative Study of Villages | Impact of libraries on reading habits, literacy influences, and economic factors affecting development.