Compatibility Test

The result comes back at ninety-four per cent. Neither of them asked for the number, and both of them are now going to spend the rest of the book unable to unknow it. The compatibility test is a certification device in which a system, rather than fate or biology, declares a pairing valid. An algorithm, a matching agency, a state programme, a village elder with a method, a questionnaire. The mechanism varies and its authority is always institutional rather than cosmic. What the device promises is certification the characters can argue with. A soulmate mark is difficult to dispute because it comes from the universe. A test was designed by somebody, using criteria, for reasons, and every one of those is available for suspicion. The reader gets the certainty and the doubt simultaneously, which is a richer position than either alone. The make-or-break element is whether the system is trusted by the world it operates in. That is the test, and it determines the whole shape of the book. If the society believes the results absolutely, then a high score is a social fact with consequences: families adjust, employers adjust, and refusing your match is a public act. If the society is sceptical, the number is a private curiosity and the couple's difficulty is internal. Both work. What fails is a book that has not decided, so that the test carries whatever weight each individual scene requires. The failure mode is the algorithm as plot device. A number is produced in chapter two to put two people in a room, and thereafter the story proceeds as an ordinary contemporary romance. The device has done a job of work and then vanished, and the reader is left holding a premise the book has stopped honouring. There is a second failure, which is the false-negative reveal. The test said they were incompatible and it was wrong, and the ending is love defeating data. That is a legitimate ending and it is also the obvious one, and a great many books reach for it because it flatters a belief the reader already holds. The harder and better version has the test be accurate and unhelpful: they are compatible, provably, and it does not tell them whether to want each other. The strongest versions use the number as pressure rather than as verdict. Ninety-four per cent means that every ordinary argument now carries a second question underneath it. If we are supposed to be this well matched, what is this. A couple with a high score has lost the right to attribute friction to incompatibility, and must therefore attribute it to themselves. The device has become more interesting rather than less as the technology it satirises has become ordinary. A reader in 2010 encountered the matching algorithm as speculation. A reader now has used three of them, has opinions about what they optimise for, and brings a working scepticism the book can play against. That is a rare position for a genre device: the audience has direct experience of the mechanism and does not need it explained. She asks him whether he would have chosen her without the number. He takes long enough to answer that she has her answer. That is the device. Not the score, but two people who cannot now tell what they would have felt without it.