Personalized and blended learning are approaches to learning that provide tailored educational experiences and often utilize technology. These approaches developed from a need to provide high-quality, individualized learning that could meet the unique needs of each student, and they provide flexibility and frequently include students' voices in the learning process. Pressey and Skinner, two pioneers of personalized learning, developed devices that aimed at improving learning by offering physical devices students could individually interact with. While blended learning was not formally mentioned until the late 1990s, much of what was called personalized learning has become blended learning. Advancements in the World Wide Web spurred the development of learning management software and self-directed learning apps, the latter finding widespread use in K-12 education since 2010 or so. The continual development of technology leaves room for new meanings of personalized and blended learning.