For the year ended 31 December 2012  The average number of persons employed by the Group (including the Executive Director) during the year, analysed by category, was as follows:  On 10 February 2011, Dialog Semiconductor Plc acquired 100% of the voting shares of SiTel Semiconductor B.V. (“SiTel”, now Dialog Semiconductor  B.V.), an unlisted company headquartered and incorporated in the Netherlands and a leader in short-range wireless, digital cordless and VoIP technology.  Dialog acquired SiTel in order to expand its product portfolio with short-range wireless and VoIP based internet connectivity products. This will allow  Dialog to develop new products for these markets as well as to cross-sell Dialog’s existing Power Management technology to SiTel’s customer base. The  acquisition significantly expands Dialog’s addressable market targeting high growth wireless personal devices. Notes to the consolidated financial statements e) Headcount  3. Other disclosures to the income statement continued 4. Business combination  Acquisition in 2011  78 Dialog Semiconductor Plc | Annual report and accounts 2012  |  Section 4 | Consolidated financial statements and notes 2012  2011 Research and Development  445  367 Production  95  69 Sales and Marketing  92  76 Admin  58  41 IT  24  20 714  573