This document discusses personal learning environments (PLEs) and personal learning networks (PLNs). It defines PLEs as learner-centered systems connected to external online services that allow individuals to manage information, generate content, and connect with others. PLNs are described as relationships and connections among peers and knowledge. The document outlines functions of PLEs like managing information, generating content, connecting with others, communication, sharing, and recording achievement. It also presents a model for building a PLE and developing a PLN.