The Z-Fold Tri-Fold Brochure is similar to the Barrel-Fold Tri-Fold Brochure in almost every way. It fits in a #10 envelope, as the barrel-fold brochure, so it is 8½ by 11 inches in size. The difference is the size of the panels and the fold itself. The small differences do make a difference in the way it is read compared to the Barrel-Fold Tri-Fold Brochure.

The folds are all the same, there is not so much of a worry about a fold-in as with the barrel-fold brochure, so each of the panels can have the same measurement.

6p is equal to 1 inch is 6 picas. 22p is equal to 3 inches and ¾ inches or 3 inches and 12 points.
The fold is different you may definitely want to layout the information to catch the readers eye. Each panel can have a connection and panels can share information.
This kind of fold makes it easier to put large charts or bar graphs or even spreadsheets of data that the reader can easily look across and get the information they need. The cover can look as if it stands on its own, and when opened become part of the rest of the paneling information.

This kind of thinking should be used when preparing the storyboard of what should go inside and how it should be presented. Always think of the audience and how they will scan your information; then choose the fold that presents your information best. Do not make the font too small or squeeze the information too close together. Then the audience will not read the information you have to offer.