2.1.391 Part 1 Section 17.15.1.13, bookFoldRevPrinting (Reverse Book Fold Printing)

a.   The standard says this element divides the page in half vertically with two left margins emanating from the bisector of the page, and two right margins instantiated at the left and right side of the page.

In Word, this element divides the page in half vertically with two right margins emanating from the bisector of the page, and left margins instantiated at the left and right side of the page.

b.   The standard describes through example the output of printed pages with page 3 printed after page 2.

Word prints page 3 on the left side of the second printed signature to allow the construction of a printed booklet. This can be visualized as follows:

Second Printed Sheet

Second Printed Signature

Sample diagram of second printed sheet shows page 1 with 1 point 5 inches left  margin, 1 inch top margin, one inch right margin, one inch bottom margin

Sample diagram of second printed signature shows page 3 printed on the left side and page 2 printed on the right side of the sheet. Margins for the sheet are 1 inch left, right, top and bottom. Two 1.5 inch margins are in the center of the sheet, separating the two pages.