Scheduling of grid jobs to exploit computational resources of different 
administrative domains is an important grid infrastructure. This paper 
discusses DISCOS, a meta-scheduler designed for scheduling grid jobs across 
administrative domains running heterogeneous schedulers. DISCOS achieves 
interoperability of grid resource monitoring data collected by heterogeneous 
schedulers through a new resource information grid service. The unified grid 
monitored data allows meta-scheduling based on dynamic administrative domain 
workload and new grid resources to be easily integrated. DISCOS is prototyped 
on the National University of Singapore Campus Grid running Globus Toolkit 3.2 
and the Community Scheduler Framework. DISCOS GUI facilitates the submission 
and monitoring of grid jobs, and demonstrates the ease of changing grid 
scheduling policies on the fly.