The five-volume set LNCS 3980-3984 constitutes the refereed proceedings of the International Conference on Computational Science and Its Applications, ICCSA 2006. The volumes present a total of 664 papers organized according to the five major conference themes: computational methods, algorithms and applications high performance technical computing and networks advanced and emerging applications geometric modelling, graphics and visualization information systems and information technologies. This is Part I.

Workshop on Computational Geometry and Applications (CGA 2006).- Workshop on Virtual Reality in Scientific Applications and Learning (VRSAL 2006).- Workshop on Visual Computing and Multimedia (VCM 2006).- Technical Session on Web Based Learning (WBL 2006).- Technical Session on Computer Graphics (TSCG 2006).- Workshop on Modeling Complex Systems (MCS 2006).- Workshop on Structures and Molecular Processes (SMP 2006).- Workshop on Specific Aspects of Computational Physics and Wavelet Analysis for Modelling Suddenly-Emerging Phenomena in Nonlinear Physics, and Nonlinear Applied Mathematics (PULSES 2006).- Workshop on Geocomputation (GC 2006).- Workshop on Pattern Recognition and Ubiquitous Computing (PRUC 2006).- Workshop on Data Storage Devices and Systems (DSDS 2006).- Technical Session on Technologies and Techniques for Distributed Data Mining (TTDM 2006).- General Tracks.