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Tests generally fall into two categories: Published and Unpublished.
Published (Commercial) Tests Published tests are those tests available for purchase from a publisher.
Usually report the issues of validity and reliability and how they were established.
Usually have population norms and standardized scores
Publishers maintain the copies of tests, test manuals, and scoring keys.
Since publishers control the copyright to tests they distribute, permissions should be made clear with the purchase.
May be expensive--in some cases very expensive
May take some time to get from the publisher
May require that the administrator must be a licensed professional or meet certain criteria.
Unpublished Tests Unpublished tests, paradoxically, refer to tests that are not available for sale via publishers. That is, unpublished in this context refers to tests which were probably published, just not for sale. Unpublished tests and measures are published in journal articles, books, dissertations - in a variety of places.
Usually are free or inexpensive
May be difficult to locate
May be issues with validity and reliability
May be issues with scoring
Need to obtain permission from the author and/or journal