in the areas of computer science and engineering using the powerful language of geometric algebra. In this process, pioneer groups started the conference series entitled ¿Applications of Geometric Algebra in Computer Science and Engineering¿ (AGACSE) in order to promote the research activity in the domain of the application of geometric algebra. The ?rst conference, AGACSE¿1999, organized by Eduardo Bayro-Corrochano and Garret Sobczyk, took place in Ixtapa-Zihuatanejo, Mexico, in July 1999. The contri- tions were published in Geometric Algebra with Applications in Science and En- neering, Birkhäuser, 2001. The second conference, ACACSE¿2001, was held in the Engineering Department of the Cambridge University on 9¿13 July 2001 and was organizedbyLeoDorst, ChrisDoran,andJoanLasenby. Thebestconferencecont- butions appeared as a book entitled Applications of Geometric Algebra in Computer Science and Engineering, Birkhäuser, 2002. The third conference, AGACSE¿2008, took place in August 2008 in Grimma, Leipzig, Germany.