Speech and language pathologists work in many settings with many different types of individuals, but there is an important distinction between pathologists who work in clinical settings and those who work in schools. A clinical speech pathologist has clients who had learned to read, write, and speak in a normal manner, but suffered a disruption in that ability due to a stroke or traumatic brain injury, for example. A school speech and language pathologist works with children who are experiencing a disorder of language development. Thus, students are learning to read and write but do not have the basic background or ability to articulate speech correctly. Speech and language pathologists who work in schools should have a teaching certificate since they work directly with teachers in a collaborative effort to enhance a child's learning. Speech and language pathologists who are trained to teach learn educational philosophy and methodology, and must complete a school internship that prepares them to be collaborative members of an educational team. Teachers of children who are speech and language impaired also must have knowledge of child development and have received special instruction in a child's mastery of reading and writing.