; (C) has demonstrated the ability to work with students who are culturally and linguistically diverse; and (D) has demonstrated teaching skills, such as through— (i) a teacher performance assessment; or (ii) other measures of teaching skills, as determined by the State. (8) Secretary The term Secretary means the Secretary of Education. (9) Teacher performance assessment The term teacher performance assessment means a program, based on State or national professional teaching standards, that will measure teachers’ curriculum planning, instruction, and assessment of students, including appropriate plans and adaptations for English language learners and students with disabilities, and multiple sources of evidence about student learning. Such assessment will be validated against professional assessment standards and reliably scored by trained external evaluators with appropriate auditing of scoring to ensure consistency. (10) Teaching credential The term teaching credential means a program of instruction for individuals who have completed a baccalaureate degree, that does not lead to a graduate degree, and that consists of courses required by a State for a teacher candidate to receive a professional certification or license that is required for employment as a teacher in an elementary school or secondary school in that State.