The main databases used in systematic reviewing are:
| Database | Theasaurus used | Short instructions |
| British Standards Online (BSOL) | BSI | BSOL instructions |
| Cambridge Scientific Abstracts contains various databases in the social sciences | various | Short instructions |
| Compendex | Compendex | Compendex training videos |
| Emerald Engineering Portal | Emerald | Short instructions |
| Global Market Information Database | GMID | Short instructions |
| IEEE/IEE Electronic Library (IEL) | IEEE | IEEE training videos |
| Proquest Central | Proquest | Proquest |
| Web of Knowledge (Science citation index) | KeyWords Plus | Short instructions |
If you are following a set search protocol, it may specify which databases you should search. There are many more databases available, you can consult our a-z listing or the subject guide for your area. If you are still unsure, consult your librarian.