1. Data Extractors Summary of Features Delivery Strategies Best Practices
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2. Summary of Features Study selection methods Variable selection methods
Case selection methods
Methods of downloading or retrieving subsets
Simple analysis capabilities
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3. Study Selection Methods
simple an extractor for a single study
list of study titles or titles organized by subject headings
a searchable catalogue of titles or variables within studies
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4. Variable Selection Methods
list of variable names
a subject index linked to a list of variables
Either may include the data dictionary entry for individual variables.
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5. Case Selection Methods
a set of pre-selected demographic variables
declare through Boolean expressions using variables within a study
through a random selection of cases
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6. Methods of Retrieval use of an ftp site, anonymous or logon
download from a Web page
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7. Simple Analysis Capabilities
frequency distributions or descriptive statistics for individual variables
simple tables of two-way tabulations or descriptive summaries
simple charts or graphs
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8. Delivery Strategies full client application
a helper application or plug-in
CGI and database applications
a network programming application
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9. Delivery Strategies full client application
independent program written to communicate with a specific server
advantage: the client has complete communication control with the server
disadvantage: the development costs to program and support a full client
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10. Delivery Strategies a helper application or plug-in
an application operating in conjunction with a Web browser
advantage: the Web browser handles the network communication
disadvantage: the development costs to program and support the application
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11. Delivery Strategies CGI and database applications
the use of Web forms to drive database requests
advantage: the Web browser handles the network communication and supports multiple platforms
disadvantage: feeding and caring the database needs standard products
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12. Delivery Strategies a network programming application
network-programs operating with a Web browser
advantage: the same Web advantages as before plus added functionality
disadvantage: same database concerns as before plus the costs of programming
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13. Best Practices modularity based on standards easy to migrate portable
off-the-shelf
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14. Best Practices modularity
a system of single-tasked utilities that communicate easily among themselves
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15. Best Practices based on standards
accepted practices for organizing and building systems
the communication among modules depends on standards
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16. Best Practices easy to migrate
easily adapt with changes in new technology
primarily, the data documentation and data must outlive current software and hardware
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17. Best Practices portable
easily used with a variety of systems, including MS/Windows, Unix and MacOS
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18. Best Practices off-the-shelf
acquire components that are commercially produced
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19. Directions to Take CARL CFI proposal Future Directions for DLI
phone conference Tuesday, Nov 30
Future Directions for DLI
moving from a pilot project to a permanent program
Strategies for COPPUL
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