Characteristics of a system determine the cleanliness level required on its parts. Methods used for cleaning of parts should be designed to provide a maximum of cleaning fluid agitation on the surfaces being cleaned, and the fluids used must be adequately clean to pick up and retain the contaminates. Depending on the part, inspection may be conducted on either the cleaning process or the cleaned part. Once cleaned, parts must be maintained in a clean condition throughout any storage, handling, or transportation. Assembly of systems presents many opportunities for contamination of parts; cleanliness precautions used during assembly should be commensurate with cleanliness levels required in the system.