The first MGC workshop held on June 2003, in conjunction with the Middleware Conference, in Rio de Janeiro, Brazil, MGC 2003, saw a variety of efforts in Middleware for Grid Computing. There were 16 technical presentations and discussions on several stimulating topics including, Classic Grids, Object Oriented technologies, Service-based Grids, Open grid Service Architecture, Agent Grid, Interactive Grid, Grid Economy / Scheduling, and Portlets. Following the workshop, extended and thoroughly revised versions of the papers were invited to a Special Issue of Concurrency and Computation: Practice and Experience Journal (CPE) published in 2004.

The second workshop in the MGC series brought together researches in the field of middleware for grid computing, addressing topics that emerged from 2003, and some novel ones such as, Strategies and Protocols for obtaining Quality of Services, Virtualization, Wireless Grids, Data Grid Middleware, Semantic Grid Middleware, Dependability and Fault Tolerance in Grid Middleware and Managing Information. The second workshop received an unprecedented number of quality submissions. Fifteen full papers and nine posters were chosen for the workshop proceedings out of the forty eight papers originally submitted. The presenters highlighted issues and solutions in one or more of the themes identified for the workshop. Following the second workshop, thoroughly revised selected papers were invited to a Special Issue of CPE Journal - Vol. 18(6), 2006. MGC 2004 was held in October, in Toronto, Canada.

The goal of the third edition of the MGC workshop was to bring together researches in the field of middleware, addressing large-scale and real world problems in grid environments, including the most interesting and stimulating topics emerged previous year, and some novel ones as Strategies and Protocols for obtaining Quality of Services, Virtualization, Wireless Grids, Data Grid Middleware, Semantic Grid Middleware, Dependability and Fault Tolerance in Grid Middleware and Managing Information. The third workshop received a good number of high-quality submissions and sixteen papers were selected for these proceedings out of the thirty-eight originally submitted, and four have been invited for posters. The presenters highlight issues and solutions in one or more of the themes identified for the workshop. A set of selected papers had authors invited to submit an extended version to be considered for another Special Issue of CPE Journal, and are currently being. MGC 2005 was held in November, in Grenoble, France.

MGC 2003, 2004, 2005 and 2006 generated substantial interest in the community and it is anticipated that this interest will continue. Far from exhausting the topics of interest, they have paved the way for a third edition of the workshop in the series.

In MGC 2007 workshop researchers from the various GRID middleware communities are encouraged to submit and present original work to be considered for publication.