The PERFORM statement executes one or more procedures.  It returns
  control to the end of the PERFORM statement when procedure execution
  ends.

  Format 3 -

   PERFORM [first-proc [ { THRU    } end-proc ]] [ WITH TEST { BEFORE } ]
           [           [ { THROUGH }          ]] [           { AFTER  } ]

       UNTIL cond

    [ stment  END-PERFORM ]

1 - first-proc

  is a procedure-name that identifies a paragraph or section in the
  Procedure Division.  The set of  statements in first-proc are the
  first (or only) set of statements in the PERFORM range.

2 - end-proc

  is a procedure-name that identifies a paragraph or section in the
  Procedure Division.  The set of statements in end-proc are the last
  set of statements in the PERFORM range.

3 - stment

  is an imperative statement.

4 - cond

  can be any conditional expression.