Periodicals Index Online
Access 
The index provides different paid packages, with only basic searches available for free -- thus attracting essentially institutions with different approach and purposes, although some paid services for individuals are also being introduced.
Fee Policy 
Mostly geared toward institutions, with different paid packages, the site provides abstracts and indexing for a fee in both electronic format and CD-ROM
Free Retrieved Material
Only basic information are offered free of charge, such as product search and overview
Linking Richness
The linking structure is limited to the site's offerings and others ProQuest products