- How is Google Scholar compared to other academic search engines and catalogues such as ScienceDirect, Scopus, and universities' own online catalogues--in terms of the following?
- comprehensiveness of search (i.e. can fetch all the ever published relevant titles, whether the user have access to full-texttexts or not)
- accuracy and precision of results
- advanced search features
- usability
Are there good reasons for (or against) using Google Scholar as the only literature search tool for PhD research?
Does the answer of (2) depend on the research discipline?