Some learners have difficulty communicating either verbally expressing ideas and needs or understanding what others say, which is known as a communication difficulty. Communication difficulties can include limited or unclear speech, difficulty saying or understanding words, and problems interacting socially. Specialists determine if a learner has a speech or language problem by taking a case history, testing hearing, assessing articulation skills, and evaluating language development, vocabulary, and language use through formal tests and natural observations. Communication difficulties are often first noticed by family, teachers, and caregivers and can negatively impact a child's academic performance if left untreated.