Learning management systems and methods are disclosed. A database arrangement of nodes is generated, the nodes representing respective content. The nodes include respective numeric attributes and weights associated with at least one of a difficulty or a theme of the respective content. A dimensional space is generated based on the database arrangement of the nodes. A first node of the nodes is selected based at least in part on a user characteristic of a user. First content associated with the first node is displayed, and a confidence metric is determined associated with the first content based on a user selection from the user of at least one confidence input mechanism. A user input associated with the first content is evaluated, and a second node of the nodes is selected based at least in part on the user input and the determined confidence metric.