WE ARE PROPOSING TO STUDY THE SCIENCE ARCHITECTURE AND COST OF A PROBE CLASS MISSION CONSISTING OF A STARSHADE FLYING IN FORMATION WITH THE WIDE FIELD INFRA-RED SPACE TELESCOPE (WFIRST) FOR THE LATTER PART OF ITS MISSION. ADDING A STARSHADE TO WFIRST WOULD ENABLE THE DIRECT IMAGING DISCOVERY AND CHARACTERIZATION OF EARTH-LIKE EXOPLANETS AROUND THE NEAREST STARS IN THE NEXT DECADE AND COMPLEMENT THE EXOPLANET SCIENCE BEING DONE BY THE CORONAGRAPH INSTRUMENT (CGI) ON WFIRST. IT WILL ALSO PROVIDE AN ESSENTIAL TECHNOLOGY DEMONSTRATION OF STARSHADES THAT WOULD PROVIDE CRUCIAL INFORMATION AND CAPABILITY TO POTENTIAL FUTURE MISSIONS. FIRST PROPOSED AS THE RENDEZVOUS MISSION DURING THE EXO-S STUDY THE CONCEPT CONTINUES TO EVOLVE AS WE WORK WITH THE WFIRST PROJECT TO MAKE CERTAIN THE RENDEZVOUS MISSION STARSHADE SYSTEM DESIGN IS COMPATIBLE WITH THE WFIRST OBSERVATORY. THIS STUDY EFFORT WILL ADDRESS MISSION ENABLING SCIENCE AND TECHNICAL ASPECTS THAT WERE NOT ADDRESSED IN THE PRIOR EXO-S STUDY. SPECIFICALLY WE INTEND TO STUDY A NEW SCIENTIFIC APPROACH TO EXOPLANET EXPLORATION WITH THE RENDEZVOUS MISSION THAT HAS EVOLVED SIGNIFICANTLY SINCE THE EXO-S WORK WAS DONE AS WELL AS EXAMINE MORE DEEPLY VARIOUS TECHNICAL ASPECTS OF THE STARSHADE AND SPACECRAFT. THE NEW WORK PROPOSED HERE WILL ENABLE THE MISSION SCIENCE PERFORMANCE TO BE EVALUATED WITH MORE UP-TO-DATE KNOWLEDGE OF THE WFIRST INSTRUMENT PERFORMANCE THAT WAS NOT AVAILABLE AT THE TIME OF THE EXO-S STUDY. IT WILL ENABLE A STUDY OF A TECHNICAL APPROACH TO THE STAR SHADE SPACECRAFT THAT MAXIMALLY SYNERGIZES WITH THE WFIRST SPACECRAFT DESIGN AND IMPLEMENTATION TO MINIMIZE OVERALL COST AND RISK TO BOTH MISSIONS. IT WILL ALSO EXAMINE MORE CLOSELY TRADES ON THE SPECIFIC ARCHITECTURE OF THE STARSHADE. FINALLY A THOROUGH COST ANALYSIS WILL PROVIDE NASA AND THE DECADAL SURVEY A DEFENSIBLE COST ESTIMATE OF THE STARSHADE SPACECRAFT.