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    Please provide an explanation as to what exactly the (S-70), (S-71), and (S71) mean. Thank you for your assistance.


    Answer

    This question is answered in the DFARS.  I can't respond any better than the following explanation and graphic.  Please read the narrative and then scroll down for the graphic:
    201.303  Publication and codification.  
      (a)(i)  The DFARS is codified under chapter 2 in Title 48, Code of Federal Regulations.  
      (ii)  To the extent possible, all DFARS text (whether implemental or supplemental) is numbered as if it were implemental.  Supplemental numbering is used only when the text cannot be integrated intelligibly with its FAR counterpart.
       (A)  Implemental numbering is the same as its FAR counterpart, except when the text exceeds one paragraph, the subdivisions are numbered by skipping a unit in the FAR 1.105-2(b)(2) prescribed numbering sequence.  For example, three paragraphs implementing the would be numbered 219.501(1), (2), and (3) rather than (a), (b), and (c).  Three paragraphs implementing FAR 19.501(a) would be numbered 219.501(a)(i), (ii), and (iii) rather than (a)(1), (2), and (3).  Further subdivision of the paragraphs follows the prescribed numbering sequence, e.g., 219.501(1)(i)(A)(1)(i).
       (B)  Supplemental numbering is the same as its FAR counterpart, with the addition of a number of 70 and up or (S-70) and up.  Parts, subparts, sections, or subsections are supplemented by the addition of a number of 70 and up.  Lower divisions are supplemented by the addition of a number of (S-70) and up.  When text exceeds one paragraph, the subdivisions are numbered using the FAR 1.105-2(b)(2) prescribed sequence, without skipping a unit.  For example, DFARS text supplementing FAR 19.501 would be numbered 219.501-70.  Its subdivisions would be numbered 219.501-70(a), (b), and (c).
       (C)  Subdivision numbering below the 4th level does not repeat the numbering sequence.  It uses italicized Arabic numbers and then italicized lower case Roman numerals.
       (D)  An example of DFARS numbering is in Table 1-1, DFARS Numbering.
     
      (iii)  Department/agency and component supplements must parallel the FAR and DFARS numbering, except department/agency supplemental numbering uses subsection numbering of 90 and up, instead of 70 and up.

    TABLE 1-1, DFARS NUMBERING
    FAR Is Implemented As Is Supplemented As
    19 219 219.70
    19.5 219.5 219.570
    19.501 219.501 219.501-70
    19.501-1 219.501-1 219.501-1-70
    19.501-1(a) 219.501-1(a) 219.501-1(a)(S-70)
    19.501-1(a)(1) 219.501-1(a)(1) 219.501-1(a)(1)(S-70)

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