This paper presents the ActiveSearch Agent, a proactive agent for suggesting similar documents to the one being browsed/edited by the user. It was designed to provide access to different documents bases in the Internet (through meta-searches to available search engines), in Intranets and in local directories, as well as to process different documents' formats (e.g., HTML, DOC, PS). The retrieval process is on-line, and it is based on the document's content and on the user's preferences. The algorithm used to measure similarity between documents is based on Vector Space model. The prototype runs in Windows OS. Preliminary tests demonstrated a very good system's performance with a superiority of 34 percentile points in the precision in relation to the GoogleToolbar.
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