Keep in mind the following limitations when using indicators for research evaluation:
- Indicators only provide a glimpse at impact since no database covers all time periods, publications, and citation data. Results will vary across databases (i.e., the h-index in Web of Science might be different from Google Scholar).
- No single indicator can tell us the entire research impact story. All indicators have strengths and weaknesses, so it’s important to use multiple, relevant indicators as appropriate.
- Not all indicators can be used to compare different subject fields and groups of researchers. Indicators that cannot be used to compare different groups include citation count, h-index, and journal impact factor.
- Bibliometric indicators only provide a number, which makes it difficult to determine context and reasons why works were cited. Using altmetrics with bibliometrics can help give a more balanced analysis.