Intuitive and simple interface to navigate and browse, although some improvement is needed. Paiying subscribers can easily download documents, while free search and browsing provide some material retrieval for all users.
The provided search option has multiple keys with simultaneous selection by author, publication, volume, issue and year
Full-text articles can be downloaded, generally in pdf format while non-subscribers can easliy save metainfo, research results and abstracts
A comprehensive help page a user guide and an email/phone help desk are available; also active is a news blog
Clear and intuitive interface design, even if an improved content categorization (particularly in the home page) would be helpful