 There she distinguishes between single-incident traumas – one-off events – which she termed Type I traumas, and complex or repeated traumas (Type II).Type I trauma, according to the United States Veterans Administration's Center for Post Traumatic Stress Disorder, "accurately describes the symptoms that result when a person experiences a short-lived psychological trauma".Type II – the concept of complex post-traumatic stress disorder (CPTSD) – includes "the syndrome that follows upon prolonged, repeated trauma".