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Very likely that what you expect from and RFID system will not be available (technically or from a physical standpoint of view). A successful integration of RFID into your processes involves more than just buying some readers with a handful of tags.
Just some points: reading range and were detection should NOT take place, performance percentage, environmental aspects (moisture, snow, ice, temperature, etc), writable tags, how many readers (close together or far away, fixed and/or mobile), response time, how many tags simultaneously, availability of other physical parameters to enhance overall system performance, impact of system failure and tag failure, electromagnetic environment, etc