A Doctor of Philosophy by publication (also known as a Ph.D. by Published Work, PhD by portfolio or Ph.D. under Special Regulation) is a manner of awarding a Ph.D. degree offered by some universities in which a series of articles usually with a common theme are published in scholarly, peer-reviewed journals to meet the requirements for the degree, in lieu of presentation of a final dissertation. Many PhD by Publication programs require the submission of a formal thesis and a viva voce.