The simplest way to discover instruments relevant to your dissertation research is to carefully read the "Methods" section in peer-reviewed journal articles. A dissertation will build on a field of study and you will be well served by understanding how the constructs you are interested in have been measured. For example, while exploring the topic of cognitive functioning, read articles and take note of which cognitive inventories are used and why.
When conducting a search, remember that different keywords yield different results. Consider these terms and add them to your search string when trying to locate tests or measurements:
In order to find assessment information on your chosen scale search for your measure with these terms: