The most effective way is not to do it. We tested this in an Oil and Gas thick desktop app and concluded after many years that users may say they understand AND vs OR but they clearly do not. In one case we even parroted back a scenario asked for by geologists and engineeers in a usability test that failed miserably. Participants simply did not understand the subleties of the search results when mixing AND/OR between search statements and within Search parameters. In the end we went back to the lessons learned in our very successful legacy app and applied the same logic. AND between search statements. OR within a search Statement. Nothing else! http://energy.ihs.com/NR/rdonlyres/B3F9B75E-821E-40A0-B9B2-2293055B3082/0/query_large.gif
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