The unique feature of these programmes is the combination of theory-based teaching phases and on the job-training phases. The programmes are run in close co-operation with 700 partner companies which are also involved in programme development. After three years of studies, the students obtain their Bachelor‘s degree and are usually offered a position by their respective training company. The Department of Public Administration (Department 3) comprises the Berlin School of Public Administration and the Berlin School of Law. The faculty conducts research in fields such as public management, non-profit management, organization theory, public organizational behavior, public change management, and broad scope of administrative and legal issues from a European and internationally comparative perspective. In the Department of Legal Studies (Department 4) prospective court officials and registrars study in an “internal” diploma programme for the wide range of legal tasks they will be entrusted with by the court and public prosecutors’ offices in the Länder of Berlin, Brandenburg and Sachsen-Anhalt. The Department of Legal Studies also offers a Bachelor of Laws degree in Commercial Law. This programme combines special legal expertise (including real estate law, property and real estate law of enforcement, insolvency law, mercantile, corporate and registry law) with business subjects, especially those in business administration. In addition, the Department of Legal Studies teaches the main degree course for the higher levels of the foreign service and offers LL.M. in "Guardian and Custodian" as well as in "Real Estate Law and Law of Execution". The Department of Police and Security Management (Department 5) provides a range of Bachelors’ and master's degree programmes which cover local, company and private sector security. This includes a police management degree programme, the graduation in which is the basic entry requirement for higher career levels in the Berlin Police Force. All the degree programmes have a practical and interdisciplinary focus, and cover topics from the Legal, Policing, Social and Economic Sciences. The Berlin School of Economics was among the first business schools in Germany to offer MBA-programmes through its Berlin Professional School (formerly known as Institute of Management Berlin (IMB))  and can look back on 15 years of experience in this field. The BPS’s core competence is the MBA programme, and especially MBAs with different key themes. The five accredited MBA programmes of the BPS aim to prepare graduates – with various foci – for leading positions in general management of businesses or in the healthcare sector. The BPS offers also three M.A. programmes and one certificate programme.