PowerPoint Presentation - Data Resources for Information Access: End User Computing

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Data Resources for Information Access End User Computing

End User Computing

Where the user does some of the programming

End User Computing

Data Model Dialog

System Design Sequence

 Develop Data Resources  Develop Dialog Structure  Attach Actions  Develop Detailed Models

End User Computing

Data Model Dialog

Data Requirements

 Operational Data  Historical Data  External Data  User Defined Data

Databases

 Operational Data  Data Warehouses  User Defined Databases

Operational Databases:

contain transaction data to support On line Transaction Processing (

OLTP

). These databases contain • large quantities of data • one record for each business transaction • real time data

Data Warehouses and Data Marts

 contain summary and historical recordsto support Online Analytical Processing (OLAP). organized for a specific business unit    historical instances summarized as appropriate flexible, read only access

Data Models

 Atomic databases (usually relational)  Rule models (for expert systems)  Image databases  Object libraries

Data Extraction Design

 Organized for flexibility rather than efficiency  Small enough to fit on user devices  Supports historical data (time stamped vs real time)  Protect corporate master files  Reduces concurrency problems for distributed data

User Defined Databases

 User managed  Not shared  Reside on clients

Data Generation

 Extraction  Capture  Entry

Functions of Data Management

 Input  Quality Assurance  Storage  Maintenance  Retrieval

End User Computing

Data Model Dialog

Dialog Purpose

 Produce Output Representations  Enable User to Call Operations and Feed Parameters to Them  Access Memory Aids  Provide Control Mechanisms

Objectives of Good Dialog Promote man/machine symbiosis.

 Identify Problem to be Solved  Identify Users for the System  Identify Functions to be Supported  Design Dialog

End User Computing

Data Model Dialog

Program Architecture

The organization of code components The objective of system architecture is to simplify maintenance by putting code together that will be changed at the same time

Architectural Philosophies

 Requirements Driven  Data Driven  Dialog Driven  Event Driven

Traditional Design

Traditional Life Cycle Approach

Formal Methodologies CASE Tools Purchased Systems 

New Approaches

RAD Evolutionary Code Object Oriented Design

End User Computing

Data Model Dialog

Business Within a Business

Most firms manage IT as a business within the business, with IT having its own  career paths  job descriptions  personality profiles

Aligning IT with the Business

Technology Excellence

(Systems)

IT User Business Profitability

(Applications)

End User Systems

Enhance customer decision making to  Identify problems in time to avoid them  Discover opportunities you would otherwise miss

End User Computing

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