The DICT Development Group

  monitoring
      n 1: the act of observing something (and sometimes keeping a
           record of it); "the monitoring of enemy communications
           plays an important role in war times"

  32 Moby Thesaurus words for "monitoring":
     custodianship, custody, eagle eye, guard, guardedness,
     guardianship, interlaced scanning, invigilation, lookout, mixing,
     observance, peeled eye, proctoring, prudence, qui vive, scanning,
     shading, sharp eye, stewardship, surveillance, switching,
     telecasting, televising, vigil, vigilance, wariness, watch,
     watch and ward, watchful eye, watchfulness, watching,
     weather eye