The document discusses issues with search strategies used in systematic reviews. It outlines several common problems: listing both PubMed and MEDLINE as they are the same database; including ScienceDirect which is limited in scope; and using keyword searches across databases without considering differences in indexing languages. Proper database searching requires understanding indexing terms, syntax, and evaluating all aspects of the search strategy. Rigorous testing and attention to detail are needed to ensure foundations of systematic reviews are sound.