A decision support system (DSS) provides marketing managers with easy access to data to help make marketing decisions. It allows interactive exploration of data to answer "what if" questions. Marketing research involves collecting and analyzing data to address specific marketing problems and inform decision making. It follows steps including defining the problem, designing the research, collecting and analyzing data, and reporting results. The internet has greatly impacted marketing research by facilitating online surveys, focus groups, and easier access to secondary data sources. Scanner-based research also provides useful insights by monitoring consumer purchase behavior and relating it to marketing mix variables.