Paper shall be chosen with regard to the photocopying process used. When printed both sides, the paper shall be sufficiently opaque to prevent the printing on one side of a sheet from transparency of the other side. Special paper may be designed for the manuscripts used for photoprocessing.
Reports shall preferably be of ISO A4(210 x 297mm). ISO A5 size(148 x 210) is recommended as the reduction size for paper economy. For your information, ISO A0 size is so decided as having the area 1 ‡u and the aspect ratio of 1:root 2 .
About 20mm should be left for binding margin at both sides when A4 sheet is used.(*1) Top and bottom of sheet should have the margins of about 24mm each, where page number and some header or footing will be used.(*2)
(*1) ISO 838-1974, Paper - Holes for general filing purposes - Specifications, decides the distance between holes 80 mm, from paper edge 12 mm, and hole diameter 6 mm.
(*2) Effective area becomes about 170 x 250 mm. This is almost equal to ISO B5(176 x 250 mm). While JIS B5 has 179 x 252 mm, a little greater than ISO B5.