Where you look for information is determined by what kind of question
you are asking. One way of classifying your question is to
ask whether you are seeking background information or foreground information.
Background information is sought when a learner has general clinical
questions regarding a topic such as what is the disorder; what causes
it; how does it present; what are some treatment options. These
questions can be answered by using "background" resources such as textbooks
(both in print and electronic) and narrative reviews in journals which
give a general overview of the topic.
Foreground information answers specific questions a clinician has
regarding a specific patient. Foreground resources can be divided
into primary sources such as original research articles published in journals;
and secondary sources such as systematic reviews of the topic, and
synopses and reviews of individual studies.