from the article:
The Map Projection Selection Tool was developed to help cartographers pick the best map projection for making maps in a GIS software program. Selecting an appropriate map projection is one of the first important decisions when working and mapping out GIS data. Since two dimensional maps require a compromise, selecting which parameters are necessary to preserve (size, shape, or direction) is important. The Map Projection Select Tool provides suggestions for picking a projection that preserves the spatial property selected and is accurate for the geographic area of interest.