From ECS to GCDIS / UserDIS
Richard Meyer
GCDIS/userDIS Challenges
	Subtle And Not So Subtle Differences In Requirements
	Different Trade-Off Perspectives And Behavior
	Issues Of Reuse Outside Project:
-	Different System Context
-	Different Engineering Groups
-	Attracting Reuse

Interconnection & Interoperation
 Interconnection & Interoperation
GCDIS/userDIS Needs Satisfied By ECS Evolution
	Bandwidth, Quality Of Service Guarantees
	Multicast, Real-Time Continuous Transfers
	Heterogeneous Naming
	Advances In Interoperability Support

GCDIS / userDIS Uniques
	Much More Heterogeneity (Unknown Targets)
	Very Low-end, Low-cost Connectivity
Distributed Information Management
Distributed Information Management
GCDIS/userDIS Needs Satisfied By ECS Evolutions
	New Data Types (Data Type Servers)
	Content Based Searching
	Advanced Search Capabilities (e.g., Support Vocabularies)

GCDIS / userDIS Uniques
	Availability, Reliability, Data Relevance Issues
	Reliability / Availability Of System Data
	Much More Heterogeneity
Service Interfaces
Service Interfaces
GCDIS/userDIS Needs Satisfied By ECS Evolution
	Configurability (Service Description)
	Adding New Services And Objects
	Accommodation Of Special Interfaces

GCDIS / userDIS Uniques
	(Re-)Usability Issues
-	More User Interface Paradigms
-	Different User Communities, Needs, Tool Environments
	No Precise Targets
Data Access And Hyperlinks
Data Access And Hyperlinks
GCDIS/userDIS Needs Satisfied By ECS Evolution
	Hyperlink Support In Data Browsing And Other Services
	Extension to Multi-Media & Collaboration Support

GCDIS / userDIS Uniques
	Direct Channels Across Unreliable, Heterogeneous Networks 
	How Universal Is The Universal Reference?
From ECS To GCDIS/userDIS
ECS Can Provide GCDIS/userDIS Components For
	Site-to-Site Interoperation
	Data Providers and Users
ECS Evolution Generally Fits GCDIS/userDIS Needs
Impact Of Uniques On Trades Needs To Be Carefully Studied
	Some ECS Components May Need Further Break-Up
	Supporting Low End Of Capacity/...ility Scale May Affect Cost Equation
Challenges Remain
	Will Need GCDIS/UserDIS Policy Input