I love the new option to incorporate filters into any PubMed search and have now set up several. It is a quick way to scope the range of literature available, although you still need to run the actual filters for any systematic review type search, especially if you are running alerts. As was mentioned by Michael P., Health technology appraisals and guidelines also incorporate systematic reviews and could be missed when using too limited a systematic review filter. You can enhance your preferred systematic review filter to include health technology assessments by adding the line below. (For comprehensiveness, I still use the PubMed systematic review filter and augment it with this and several other strings.) health technology assessment* [tiab] OR "Technology Assessment, Biomedical" [mh] OR HTA [tiab] OR HTAs [tiab] I hadn't thought of "health technology appraisal" before (I just did a quick search and there were 8 hits, almost all of which would have been picked up using the above string) but that could also be added: health technology appraisal* [tiab] Guidelines are partially incorporated into the PubMed systematic filter. They could also be searched separately using more precise text strings (e.g., practice guideline* [tiab] OR "practice parameter* [tiab] OR CPG [tiab] OR CPGs [tiab]) . A grey literature search for guidelines is essential, though, as many of them aren't published in peer-reviewed journals and thus still don't make it into traditional databases. Becky Skidmore Medical Research Analyst / Analyste de recherche médicale The Society of Obstetricians and Gynaecologists of Canada / La Société des obstétriciens et gynécologues du Canada (SOGC) 780, promenade Echo Drive Ottawa, ON K1S 5R7 Phone / téléphone : 613 730 4192 ext 246 800-561-2416 ext 246 Fax / télécopieur : 613 730 4314 Email / courriel : [log in to unmask] <mailto:[log in to unmask]> Web / Site Web : www.sogc.org <http://www.sogc.org/> <http://sogc.org/cmes/qc2010/index.aspx>