text: ( 2 ) preparation of a quality assurance plan with data quality objectives ; ( 3 ) preparation of written descriptions of laboratory standard operating procedures ( SOP 's ) for test organism culturing , toxicity testing , instrument calibration , sample chain-of-custody , laboratory sample tracking system , etc . ; and ( 4 ) provision of adequate , qualified technical staff and suitable space and equipment to assure reliable data .
  
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  Preparation of quality data can often lead to more accurate results .