There are still variety of areas of the world that are not designed. It could be because of a lack of economic rationality or because they are a social minority. The guide dog harness was one of those reasons. Conventional harnesses were based on those invented in Germany after the First World War, and they remained almost the same shape for more than half a century. The research revealed that the harnesses were putting a lot of stress on the guide dogs, and that they were also having a serious effect on the users' bodies. After more than a year experimentations, a suit-type harness "Lati" for office use and a handle combined with hand sonar was designed to make life safer and more comfortable for both users and guide dogs.