Changed shape of key: an approach to enhance the performance of the soft keyboard

Text entry using a soft keyboard on small mobile devices is difficult, one reason being that there is often an offset when typing. This essay presents a soft keyboard whose key shapes have been changed in order to avoid the problem of offset. An app and a usability test prove that this soft keyboard with a changed shape of the keys can increase words per minute and reduce the error rate. Another finding is that a large space between keys is preferred.