Here is a summary of the main ideas behind DoubleTrust:
1. Main motivation: It is based on the simple premise that trusting two authorities is better than one. By presenting the intersection and non-intersection of Google and Yahoo very clearly, it shows the best results according to their MUTUAL agreement, and also the remaining sites which are unique to each engine (the ORPHANS), giving more options to the user.
2. Trust-o-meter and TrustRank: Meta-search has this problem of doing its own thing with results and taking control away from the user. TrustRank gives user control of the ordering of the common results by defining their own trust level for each engine. A weighted score is then computed using the user's trust options.
3. Compact Interface: Highly compact but convenient representation of around 80 results on page using tables and DHTML, gives the user a quick view of the results and allows quick selection and searching, saving time.
4. More freedom to choose: By presenting important properties of each search page like size, domain etc in a clear comparative representation, DoubleTrust allows the user freedom in choosing the results using other than just ranking. For example, looking for an essay on American History , one may prefer pages with more content say 50K than the smaller pages. A clear comparison using graphics and colors gives the user an immediate way to compare these other properties, which are usually buried in conventional search results.