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 ÔUniquesÕ
¥	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 (ÔData Type ServersÕ)
¥	Content Based Searching
¥	Advanced Search Capabilities (e.g., Support ÔVocabulariesÕ)

GCDIS / userDIS ÔUniquesÕ
¥	Availability, Reliability, Data Relevance Issues
¥	Reliability / Availability Of ÔSystem DataÕ
¥	Much More Heterogeneity
Service Interfaces
Service Interfaces
GCDIS/userDIS Needs Satisfied By ECS Evolution
¥	Configurability (ÔService DescriptionÕ)
¥	Adding New ÔServicesÕ And ÔObjectsÕ
¥	Accommodation Of Special Interfaces

GCDIS / userDIS ÔUniquesÕ
¥	(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 ÔUniquesÕ
¥	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 ÔUniquesÕ 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