- Online surveys have both advantages and disadvantages. They are low-cost and convenient to administer remotely, but respondents may not provide accurate or honest answers due to lack of accountability or memory. Data errors can also occur. - The advantages of online surveys are that they are relatively easy and low-cost to administer, can reach a large number of respondents, and allow for extensive data collection and analysis. Standardized online surveys can reduce biases. - The document discusses designing effective surveys, including using validated instruments, considering aesthetics and question order, and collecting data through various methods like interviews, telephone, or electronic surveys. The goal is to maximize response rates and obtain meaningful results.