See Doctorate.

A person who has a degree and has undertaken years of research and has published their work and been assessed, may be awarded a PhD and can use the title of Doctor. This is a specialist degree that is usually awarded for at least 3 years of supervised, but original research work. All research students starting Ph.D. research would expect to hold a good degree first. A person with a Ph.D. degree uses the title "Dr"

To be admitted to candidature for a PhD degree, students are expected to have an honours degree, at least at upper second-class level, from an Australian or other recognised university. Applicants should also show a capacity for original research.

an American doctorate usually based on at least 3 years graduate study and a dissertation; the highest degree awarded by a graduate school

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