Lexical divorce between source and target is evaluated by the existence or absence of collocations of common source and target triggers.

Of all source super triggers found through the source domain collocation searches described above, only a small subset appear regularly or even semi-regularly near or next to a target domain word.

These patterns confirm that target domain directed searching may not be a particularly efficient or effective way of finding source domain language.

The distribution also indicates that lexical divorce between source and target triggers is a significant obstacle to those automated extraction systems which rely on close collocations between source and target lexis.