In Forrester's 56-criteria evaluation of cross-channel attribution vendors, we identified the eight most significant cross-channel attribution providers with advanced algorithmic-based models — Abakus, AOL/Convertro, eBay Enterprise, Google, Marketing Evolution, MarketShare, Rakuten DC Storm, and Visual IQ — in the category and researched, analyzed, and scored them. This report details our findings about how well each vendor fulfills our criteria and where they stand in relation to each other, in order to help customer insights (CI) professionals select the right partner for their cross-channel attribution.