Drawings are typically released and revised as the design process progresses. Depending on the companies engineering and construction requirements depends on how the drawings are releases. Listed below are several different typical revisions on drawings. Drawing revisions fall into one of three categories (typically). Review, Construction and As-Built.
Issued for Review
Issued for Construction
Typically the final release of drawings prior to construction. Drawings that are marked IFC should be of a quality that can be constructed off of
Issued As-built
After completion of the project a updated set of drawings should be revised with all the changes that may have occurred during construction.