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A Bachelor of Science (Bc., B.S., BS, B Sc, B.Sc. or BSc; less commonly, S.B., SB, or Sc.B. from the Latin Scientiæ Baccalaureus) is a graduate academic degree awarded for completed courses that generally last three to five years.
Whether a subject is considered a science or an art, can vary between universities. For example, an economics degree may be given as a Bachelor of Arts (B.A.) by one university but as a B.Sc. by another. Biology, biochemistry, mathematics, physics, chemistry, social science, sport/exercise science, general science, earth science, computer science and the various fields of engineering are almost universally considered to be sciences.
Even in cases of near-unilateral consensus across a country as to whether a subject is a science or an art, there are exceptions. Georgetown University's School of Foreign Service awards Bachelor of Science in Foreign Service degrees to all of its undergraduates, although many of them major in humanities-oriented fields such as international history and culture and politics. The London School of Economics offers B.Sc. degrees in practically all subject areas, even those normally associated with arts degrees, while the Oxbridge universities almost exclusively award arts qualifications. In both instances, there are historical and traditional reasons. Northwestern University's School of Communication grants B.S. degrees in all of its programs of study, including theater, dance, and radio/television/film.
The first university to admit a student to the degree of Bachelor of Science was the University of London in 1860. Prior to this, science subjects were included in the B.A. bracket, notably in the cases of mathematics, physics, physiology and botany.
In Argentina, most University degrees are given as a License on <field/discipline> and are somewhat equivalent to a combined Bachelor of Science/ Master of Sciences degree. All degrees are specific to a field and usually are 5 to 6 years programs including a 1 to 1.5-year mandatory professional training period which may start only after students completed 70-80% of the courses required, (usually start at the 5th year). For instance besides the courses, Biochemistry (5 years) and Biology (6 years) require 1-2 years hands- on training either in a clinical laboratory plus final exam (for biochemistry) or in a research lab plus a thesis defense (Biology). The degrees are named as "Licensed in <field of study or profession i.e Biology, Biochemistry, Nutrition, Physical Therapy & Kinesiology, etc>. However, the Master degree will require 2-3 more years of specific training/courses plus a written thesis with defense in front of a thesis committee.
Engineering and M.D. degrees are also different and are 6-years programs of specific classes and training starting immediate after high school. No intermediate degrees count towards the admission exam or even exist(except for systems analysts in Information Systems Engineering). MD degrees are complemented with a 3-4 years of Hospital Residence plus 1-2 Specialization training.
In Australia, the B.Sc. is a three-year degree, offered from first year on. A fourth (Honours) year or a Master of Science (M.Sc.) is then required to progress on to Doctor of Philosophy (Ph.D.) In New Zealand, in some cases the Honours degree comprises an additional postgraduate qualification. In other cases, students with strong performance in their second or third year, are invited to extend their degree to an additional year, with a focus on research, granting access to doctoral programs. In South Africa, the B.Sc. is taken over three years, while the "postgraduate" B.Sc. (Hons) entails an additional year of study. Admission to the honours degree is on the basis of a sufficiently high average in the B.Sc. major; an honours degree is required for M.Sc. level study; and admission to a Doctorate is via the M.Sc.
Commonly in British Commonwealth countries and Ireland graduands are admitted to the degree of Bachelor of Science after having completed a programme in one or more of the sciences. These programmes may take different lengths of time to complete.
A Bachelor of Science receives the designation B.Sc. or B.S. for a major/pass degree and B.Sc. (Hons) or B.S. (Hons) for an honours degree. In England, Wales and Northern Ireland an honours degree is typically completed over a three-year period, though there are a few intensified two-year courses (with less vacation time). In Scotland, where access to university is possible after one less year of secondary education, degree courses have a foundation year (simply known as the First year) making the total course length four years. In Ireland the former B.Sc. was changed to B.Sc. (Hons.) which is awarded after four years. The B.Sc. (Ord.) is awarded after three years. Formerly at the University of Oxford, the degree of B.Sc. was a postgraduate degree; this former degree, still actively granted, has since been renamed M.Sc.
In the United States and Canada, a bachelor's degree in science is generally a four-year  undergraduate degree typically used in engineering, computer science, mathematics, economics, and the natural sciences. In some cases it is used in professional studies of areas involving law, medicine, business, hospitality, nursing, or architecture.
Many universities in Europe are changing their systems into the BA/MA system, and in doing so also offering the full equivalent of a B.Sc. or M.Sc. See Bologna Process.
Universities in the Czech Republic are changing their systems into the Bachelor of Science / Master of Science system, and in doing so also offering the full equivalent of a B.Sc.(Bc.) or M.Sc. (Mgr./Ing.).
In Germany there are two kinds of universities: Universitäten and Fachhochschulen (which are also called University of Applied Sciences). Universitäten and Fachhochschulen – both as well called Hochschulen - are legally equal, but Fachhochschulen have the reputation of being more related to practice.
The B.Sc. in Germany was equivalent to a B.Sc. (Hons.). Many universities in German-speaking countries are changing their systems to the BA/MA system, and in doing so also offering the full equivalent of a B.Sc.
In Germany the B.A. normally lasts between three and four years – six to eight semester - and between 180 and 240 ECTS must be earned.
In Brazil, a Bachelor of Science degree is a graduate degree and is also more specific, usually containing a one-year mandatory probation period by the end of the course, followed by relatively elaborate written and oral evaluations.
Australia, Austria, Barbados, Belgium, Belize, Bosnia and Herzegovina, Cameroon, Cote d'Ivoire, Croatia (mostly three years, sometimes four), Czech Republic (mostly three years, sometimes four), Denmark, England (three or four years with a one-year placement in industry), Estonia, Finland, France, Germany (mostly three years, but can be up to four years), Hong Kong (Starting to change to 4 years in 2012), Hungary, Iceland, India (three years B.Sc. in pure sciences excluding engineering and medicine and four years engineering program "Bachelor of Engineering"), Ireland (Ordinary), Israel (for most subjects), Italy, Jamaica (three or four years), Latvia (three or four years), Lebanon (three or four years, five years for Bachelor of Engineering), Malaysia, the Netherlands, New Zealand, Northern Ireland, Norway, Poland, Portugal, Romania, Scotland (Ordinary), Singapore (honours degree takes 4 years), Slovakia, South Africa (honours degree takes 4 years), Sweden, Switzerland, Trinidad and Tobago, Uganda (mostly three years, sometimes four), United Arab Emirates, Wales and Zimbabwe.
Armenia (four or five years), Albania (four or five years), Afghanistan, Azerbaijan (four or five years), Australia (honours degree), Bangladesh (three or four years), Bahrain, Belarus, Belize, Brunei, Bosnia, Bulgaria, Canada (except Quebec), Cyprus, Egypt (four or five years), Finland (engineering, practice in industry not included), Georgia, Guatemala, Greece (four or five years), India (four years (BS (engineering)), Indonesia, Iran (four or five years), Iran, Iraq, Ireland (Honours Degree), Israel, Japan, Jordan (four to five years), Kazakhstan, Korea, Kuwait, Lithuania, Libya, Malawi (four or five years), Malta, Macedonia (three, four or five years), Montenegro (three, four or five years), Mexico, Myanmar, New Zealand (honours degree), Nigeria, People's Republic of China, Pakistan (four or five years), the Philippines (four or five years), Puerto Rico, Romania, Russia, Saudi Arabia, Scotland (Honours Degree), Serbia (three, four or five years), Slovenia (four or five years), South Africa (fourth year is elective - to obtain an Honours degree, which is normally a requirement for selection into a Masters degree programme), Sri Lanka(three four or five(specialized) years), Taiwan, Thailand, Turkey, Korea Republic, Haiti (three or four years), Ukraine, United States, Uruguay, Yemen, Zambia (four or five years).
Cuba (five years), Greece (four or five years), Peru, Argentina, Canada (especially Quebec), Colombia (Starting to change to 4 years), Venezuela, Brazil (five years), Mexico (4.5 years), Chile (usually 5 years where last year includes professional training, thesis and specialization courses), Spain, Egypt (four or five years), Haiti (four or five years).
Nigeria (four to five years), 6 months dedicated to SIWES (Students Industrial Work Exchange Scheme) but for most sciences and all engineering courses only. A semester for project work/thesis not excluding course work during the bachelor thesis. Excluding 1 year for the compulsory National Youth Service Corps (NYSC), para-military and civil service.
In Algeria, the student presents a thesis in front of a Jury at the end of the fifth year.