Chaired and Organised the following special sessions and Tutorial Workshops:

• special session on Evolving and Adaptive Fuzzy Systems at the 2012 IEEE World Congress on Computational Intelligence, Brisbane, Australia, 10-15 June, 2012
• special session on Evolving and Adaptive Intelligent Systems at the 2011 International Conference on Systems, Man and Cybernetics, SMC, Anchorage, Alaska, USA, 9-12 October, 2011
• special session on Evolving and Adaptive Fuzzy Systems at the International Conference on Fuzzy Systems, FUZZ-IEEE 2011, Taipei, Taiwan, 27-30 June, 2011
• special session on Evolving Fuzzy Systems at the World Congress on Computational Intelligence, WCCI 2010, Barcelona, Catalunya, Spain, 18-23 July, 2010
• special session on Computational Intelligence in Machine Learning at the World Congress on Computational Intelligence, WCCI 2010, Barcelona, Catalunya, Spain, 18-23 July, 2010 (Chairs: Daniel Sanchez, Plamen Angelov, Eyke Huellermeier, Frank Klawonn)
• special session on Managing Uncertainties in Data Streams at the International Conference on Information Processing and Management of Uncertainty in Knowledge-based Systems, IMPU 2010, Dortmund, Germany, 28 June - 2 July, 2010
• special session on Fuzzy Methods for Data Mining and Knowledge Discovery at the joint FUZZ-IEEE2009 Interntaional Conference on FUzzy Systems, Jeju island, Korea, 20-24 August, 2009
• special session on Recent Advances in Evolving Fuzzy Systems at the joint IFSA World Congress and EUSFLAT 2009 Conference, Lisbon, Portugal, 20-24 July, 2009
• special session on Fuzzy Methods in Machine Learning and Data Mining at the joint IFSA World Congress and EUSFLAT 2009 Conference, Lisbon, Portugal, 20-24 July, 2009
• special session on Uncertainty in Machine Learning and Data Mining at the 12 International Conference on Information Processing and Management of Uncertainty in Knowledge-based Systems, IPMU-08, June 22-27, 2008 - Malaga, Spain
• special session on Evolving and Self-Developing Intelligent Systems at the 2008 IEEE Symposium on Intelligent Systems, Varna, Bulgaria, 6-8 September 2008
• Tutorial Workshop on Design of Real Time Evolving Fuzzy Systems: Methodology, Algorithms & Applications, IEEE International Conference on Fuzzy Systems FUZZ-IEEE 2007, 23-26 July, 2007, London, England
• Tutorial Workshop on Evolving Intelligent Systems: The Knowledge Engineering Approach, IEEE Symposium Series on Computational Intelligence, 1-5 April, 2007, Honolulu, Hawaii, USA
• Tutorial Workshop on Evolving Neural- Fuzzy- and Hybrid Intelligent Systems, World Congress on Computational Intelligence (WCCI), Vancouver, BC, Canada, July 16-21, 2006
• invited session on Artificial Neural Networks Inspired by Genetic and Quantum Information Processes, 2007 International Joint Conference on Neural Networks, Orlando, FL, USA, 12-17 August, 2007
• invited session on Evolving Intelligent Systems, The 2007 IEEE International Conference on Systems, Man, and Cybernetics, 7-10 October 2007, Motreal, Canada
• invited session on Evolving Neuro-, Fuzzy and Hybrid Systems at WCCI, Vancouver, Canada,16-21 July, 2006
• invited session on Evolving Fuzzy Systems at the 24th NAFIPS Conference, Ann Arbour, MI , USA, June 2005
• special session on Adaptive Intelligent Systems at the IEEE Symposium on Intelligent Systems IS'02, Varna, Bulgaria, 10-12 Sept. 2002 (published in a separate edited volume II of the proceedings)
• special session on Intelligent Modelling and Control at the EUSFLAT-2001 Conf., Leicester, 5-7 Sept. 2001
• chaired an invited session on Intelligent Control at the IEEE Conference on Industrial Electronics and Control, IECON-2000, Nagoya, Japan, 22-28 October 2000.

Member of the Organising Committees of the following International Conferences

• FUBEST '94 (FUzzy Based Expert SysTems), Sofia, Bulgaria,28-30 September 1994
• BioProcess Systems '94, Sofia, Bulgaria, 26-29 September, 1994 • BioProcess Systems '95, Sofia, Bulgaria, 2-5 October, 1995
• FUBEST '96, Sofia, Bulgaria, 9-11 October 1996
• BioProcess Systems '97, Sofia, Bulgaria, 14-16 October, 1997