Bachelor of Philosophy
The B.Phil.'s earliest form is as a University of Oxford graduate degree, first awarded in 1682. Originally, Oxford named its pre-doctoral graduate degrees the Bachelor of Philosophy (B.Phil.) (a two-year degree, partly taught and partly by research) and the Bachelor of Letters (B.Litt.) (a two-year research degree). After complaints, especially from overseas students, that this naming convention often meant that graduate degrees were not being recognised as such, the University renamed them Master of Philosophy (M.Phil.) and Master of Letters (M.Litt.). However, the Philosophy Faculty (then a Sub-Faculty) argued that its B.Phil. degree had become so well known and respected in the philosophical world that it would be confusing to change the name. In philosophy, therefore, the degree continues to be called the B.Phil. Those who pass the degree are given the choice of taking a B.Phil. or an M.Phil.; few if any choose the latter. (Note that Oxford also offers a number of other graduate degrees labeled as baccalaureate degrees: the law faculty's BCL; and the music faculty's B.Mus)
Master of Philosophy
In most UK universities, completion of an M.Phil. typically requires two years of full-time or five years or more of part-time study (being five or eight years from initially entering university) and the submission of a thesis comprising a body of original research undertaken by the candidate. It is common for students admitted into a Ph.D. program at a UK university to be initially registered for the degree of M.Phil., and then to transfer (or upgrade) to the Ph.D. upon successful completion of the first (or sometimes the second) year of study: this will often involve the submission of a short report or dissertation by the student, and possibly an oral examination or presentation. In addition, most universities allow examiners to recommend award of an M.Phil. if a Ph.D. candidate's thesis is deemed not to be of the requisite length or standard for a doctorate. However, many students register for an M.Phil. with no intention of upgrading to a Ph.D. Others are not able to do a Ph.D. because their research does not have sufficient scope for a Ph.D. or because they are seeking a shorter program.