Support materials might include digital "Read me" files, printed "help" documentation or printed supplementary materials, user-licence agreements and copyright notices, and audio and video cassettes.
Frequently, the design of these materials is left to the last minute with the result that user documentation is poor and does not do the job for which it is intended. In projects running behind schedule, one often finds software being trialled in advance of the production of support materials. This is seldom satisfactory and compromises the reliability of trialling.