What is the fine-grained topic of the following text: In the three-plus years since introducing Personalized Learning (PL) in individual schools within a large public school system, the Imaginarium, Denver Public Schools’ (DPS) innovation lab, has been studying the conditions that help and hinder the implementation of PL at scale. Only return the topic.
Implementation and study of Personalized Learning in Denver Public Schools by the Imaginarium innovation lab.