Each program arranges printing in their own way. Typically, it is possible to accentuate several basic levels of the operation and, consequently, specify the possible errors. Assume that a word processor is being tested and, so that to have idea of its printing capabilities, it must print a few words in italics. Offshore testing companies use beneficial strategies to run printer testing that produces desirable results.
An error is not caused by the device. If the program does not send an Italicize command to the virtual printer, does not transmit the text but sends it to modem, instead of the printer, the device has nothing to do with this situation. This is a purely logical error, and it should be necessarily identified before you begin to test a variety of printers.
Error specific for the class of printers. If the program is organized so that a separate block of the code can work with each class of printers, then it is probable that the program correctly works with one class of printers, but develops glitches when working with another. For example, it correctly manages matrix printers and printers that use the PostScript language, but refuses to work with LaserJet printers.
Error specific for drivers. The program may have the part of the code or command translation table used to work with a particular group of printers, in other words, its component is a built-in driver. The same driver can be used for a number of the same type of printers, for example, Epson FX driver can work with FX-80, FX-85, FX-100 printers and others. And if the error is present in the driver, it will occur when you work with all the printers in the group.
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Error specific for the printer. These errors occur if the printer does not support the use of the selected driver or the printer is not fully compatible with the other devices in its group. Often the manufacturers declare their printers as 100% compatible with X printer belonging to one of well-known companies, but, in fact, it is just the other way round, and individual commands or control codes for the printer simply do not work.
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