The following figure presents the overall layered architecture of the K-WfGrid system. The architecture is composed of four horizontal layers (A, B, C, D) and the vertical knowledge layer (K).

The horizontal layers are the Web Portal (A), the Grid Application Building layer (B), the Grid Application Control layer (C), and the Low Level Grid Middleware layer (D).


Each horizontal layer only communicates with the proximate layers so single layers can be modified or replaced without changing the whole system.

The Web Portal (A), for example, receives data from the Knowledge layer (K) and communicates interactively with the components of the Grid Application Building layer (B) but does not have direct connection to the Low Level Grid Middleware (D).