After it was thought that Wi-Fi and Bluetooth were not good enough and suitable for some applications, it was decided to have ZigBee style networks in 1998, actually it was realized that need for self-organizing ad-hoc digital radio networks. There was a problem with Philips because Philips semiconductors stopped the investment. On the other hand, Philips lighting kept being a promoter member of ZigBee Alliance board of directors. Officially, ZigBee Alliance was announced in October 2004. It had more than 100 member companies almost all over the world. Also, number of members were increased almost double of previous years. In addition, next year (after December 2005), more than 200 companies became member which is quite high number.
Most importantly, ZigBee specification were approved on 14 December 2004 which is named as ZigBee 2004 Specification. After approvement, its public availability was announced 13 June 2005. In September 2006, ZigBee 2006 Specification was announced with member availability version. After all these developments, throught the end of 2007, ZigBee PRO which is final version was announced. It contains enhanced ZigBee specification.
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