The timeline is interactive and clickable so the user is passed to further descriptions relative to each program.  The PTO has a host of different initiatives designed to speed up the patenting process and improve the quality of its patents.  These programs apply at the pre-filing stage and after a patent is granted.  The chart does a good job of organizing this information for one steeped in the patenting process far enough to know what the various stages are and what some of  the programs may be used for.  For others,  it is a lot of information in a nice tight package.