The following is a question from a VOSON user, submitted via email (edited):

"Depth of crawl (levels)" parameter was set to 4 levels, expecting this would yield a crawl that would discover (within the constraints of the other parameters), chains of hyperlinks of the form seed-->i-->j-->k.  The data lacks any i-->j links.  Can you help me understand what the depth/level parameter does?

The answer was:

The depth of crawl (levels) parameter affects how deeply the crawler goes into any particular seed site. So the entry page is level 1, pages (within the seed site) that are linked from the entry page are level 2, and so on.

At present, VOSON does not automatically snowball. To iteratively crawl: just add the new seed sites  (discovered by first crawling seed site)  in the "add seeds sites window".