The NETP identifies micro-credentialing as an example of a strategy for ongoing professional learning with options for teacher competency development. Micro-credentials, sometimes called digital badges, provide verification of a specific skill or set of skills for which a teacher has demonstrated competence. Examples of competencies range from setting learning goals to using technology for assessment. Hundreds of educational micro-credentials have been developed by a growing number of issuers, such as universities, education non-profits, and state and local education agencies. In most cases, micro-credentials are offered in a “stackable” series of competencies. Although teachers and others can independently earn micro-credentials, many states and districts have adopted them as supplements to traditional professional learning. Cited reasons for the growing interest and appeal of micro-credentials include the ability to personalize professional learning, the use of research behind each competency-based area, and the on-demand nature of application and completion.