Making a Paper Prototype - Paper Prototyping: The Fast and Easy Way to Define and Refine User Interfaces - page 55

Figure 4.1: Paper prototyping makes use of common office supplies—those that are harder to find
in stores are readily available online.
Figure 4.2: Removable tape, such as the Post-It brand shown here, is useful in paper prototyping.
It comes in several widths.
Figure 4.3: This prototype shows the use of both removable tape (line items) and transparency
(the total). In this example the Computer wrote these elements on the fly to show the results of the
user's actions; on screens with data entry fields the users would write on the tape or transparency
themselves.
For lugging these supplies to meetings, old conference bags are ideal unless you're already using them
for your groceries. You can also buy a plastic toolbox—one of my colleagues uses bright-colored ones