papers, prints, plans, and so on, that bear on the work performed. This will be discussed later in the chapter.    Departure from specifications. This is a lack of compliance  with  any  authoritative  document, plan,   procedure,   or   instruction.   A   detailed discussion will follow later in the chapter.    Documentation. This is the record of objective evidence establishing the requisite quality of the material,  component,  or  work  done.    Level of essentiality. A level of essentiality is a certain   level   of   confidence   required   in   the reliability of repairs made. The different levels of essentiality will be discussed later in the chapter.    Procedure. A  procedure  is  a  written  instruction designed  for  use  in  production  and  repair, delineating  all  essential  elements  and  guidance necessary  to  produce  acceptable  and  reliable products.   Process.  This is a set of actions written in a special  sequential  order  by  which  a  repair  or maintenance action, a test, or an inspection is done   using   specific   guidelines,   tools,   and equipment. Reliability.  Reliability  means  the  probability that an item will perform its intended function for a specified interval under stated conditions. SUBSAFE.   The   acronym   SUBSAFE   is   a shorthand reference to the Submarine Safety Program,   which   provides   a   high   level   of confidence in the material conditions of the hull integrity  boundary.  SUBSAFE  will  be  discussed later in the chapter. THE CONTROLLED WORK PACKAGE To  provide  additional  assurance  that  a  quality product will result from the in-process fabrication or repair,  the  controlled  work  package  (CWP)  was developed.  It  provides  QC  techniques  (requirements  or procedures) and shows objective quality evidence (documentation)  of  adherence  to  specified  quality standards. These requirements or procedures include both   external   (type   commander)   and   internal (command-generated)  information  for  work  package processing  and  sign-off.  The  typical  CWP  that  will arrive at your desk will have QA forms, departure from specifications   forms,   material   deficiency   forms, production  task  control  forms,  and  QC  personnel sign-off  requirements.  You,  and  all  the  other  work centers involved in the performance of the task, must review the contents of each package as well. When you review  the  package,  check  that  the  requirements specified  for  their  accomplishment  are  correct,  in  a correct sequence, and soon. Each CWP covers the entire scope of the work process and is able to stand on its own. Traceability   from   the   work   package   to   other certification  documentation  is  provided  by  the  job control number (JCN). You must ensure that the CWP is at the job site during  the  performance  of  the  task.  If  the  work procedure requires the simultaneous performance of procedure steps and these steps are done in different locations,  use  the  locally  developed  practices  to  ensure that you maintain positive control for each step. Immediately after a job is completed but before the tended unit gets underway, each assigned work center and   the   QAO   will   review   the   work   package documentation for completeness and correctness. If you and your workers have been doing the assigned steps as stated, this should not be a problem. Ensure that all the verification signature blocks are signed. Make sure all references,  such  as  tech  manuals  or  drawings,  are returned to the appropriate place. Enclosures You will find a lot of documentation inside the CWP when it arrives at your desk. Inside will be process instructions,  plans,  technical  drawings,  and  instructions pertinent to the production job at hand. Documents listed as references are not included in the CWP but must be available when required. You will also find a copy of applicable  portions  of  references  included  in  the  CWT. The 4790/2R, Automated Work Request, is included in the  CWP  to  provide  complete  documentation  and reference back to the originating tended unit. You will use all of the documentation to perform the maintenance action, production task, or process assigned to your work  center. Revisions You  can  make  minor  corrections  to  the  work procedure (as directed by local instructions) as long as they  do  not  change  the  scope  of  the  work  being performed. However, if you need to change the original scope of the job, such as working on a part not originally intended to be worked on, you must initiate a  revision. The revision cover sheet gives exact instructions on 6-9