def __init__(self,rawData):
    self.allROs = []        # collection of all relief opportunities aka array of ReliefOpp objects
    self.allWPs = []            # all work pieces
    self.allShifts = []         # all candidate shifts
    self.schedule = Schedule() # creates Schedule Object, which is a list of shifts making up the schedule
    self.prepData(rawData) #

  def alg_firstEncountered(self):
    for w in self.allWPs:       # scan work pieces sequentially
      if w.coverCount == 0:
        s = w.shifts[0]
        self.schedule.addShift(s)
        s.selected()
    self.schedule.rm_redundantShifts()
    self.schedule.printSchedule()