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1. Open ArcToolbox
2. Open Data Management Tools -> →  Projections and Transformations --> Feature -> → Feature → Project.  The Project dialog box will appear.
   1. Under Input Data Set or Feature Class, choose the Map Layer for which you want to change the Projection.
       
   1. Under Output Data Set or Feature Class, check to make sure that the file is being saved in the same folder as the rest of your Map and Data Layers.  Rename the new Map Layer so that you will recognize it and be able to distinguish it from the Map Layer you are changing.
       
   1. Under Output Coordinate System, click on the Properties button (looks like a sheet of paper with a pointing finger hovering over it).  The Spatial References Properties dialog box will appear. Click the Select button.  The Browse for Coordinate System dialog box will appear.
3.      Choose the Projected Coordinate System folder or the Geographic Coodinate System folder, depending upon the Coordinate Systems of your other files and how you want to match them. 
   1. For assistance in chosing a Coordinate System, contact Krista White, GIS Support Specialist at x3926 or Dr. Catherine Riihimaki at x       .
       
   1. Choose the correct Coordinate System from the available options and appropriate region.  Once you've selected the desired Coordinate System, you'll be taken back out to the Spatial References Properties dialog box.
4.  Click   Click the Apply button to apply the chosen Coordinate System.  Then click OK twice.

By changing the name of the Shapefile/Map Layer in the Projection process, you've created a new Map Layer/Shapefile with the desired Coordinate System.  You will need to add this new Map Layer to your map and/or Geodatabase, and remove the old Map Layer that uses the incorrect Coordinate System.

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