Perhaps the most important issue is to make sure that you have identified the resolution of your analysis and have the appropriate grid definitions loaded into BenMAP-CE. See Chapter 4 (Section 4.1.1) to read about grid definitions. The next key step, which is closely connected to the grid definitions, is to determine the data that you want to use. Data such as air quality modeling, incidence data, and population data need to match the grid definitions that you are using. You also need to be careful about the formatting of your data when loading it into BenMAP-CE. Chapter 4 also provides information on loading data into BenMAP-CE.