Difference between revisions of "TAIS"

From Cibernética Americana
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== Studentenliiteratur ==
== Studentenliiteratur ==
The TOC as reproduced below does not capture the incidence string style of the Auerbach original text, for example "Boundary Operator for Generalized Systems" the is marked &sec; "12.31".
# Systems Theory
# Systems Theory

Revision as of 12:57, 6 August 2009

Wiki Article on Langefors

Theoretical Analysis of Information Systems¹ is a published approach to mathematical modeling of a general enterprise information system based on systems theory and algebra. Its results are basic and startling only to the degree in which something like what the book does has not become an element of common IS practice.


The TOC as reproduced below does not capture the incidence string style of the Auerbach original text, for example "Boundary Operator for Generalized Systems" the is marked &sec; "12.31".

  1. Systems Theory
    1. Basic Problems of Systems Theory
      1. Needs for a Formal Systems Theory
      2. Common Faults in Systems Design Analysis
      3. Different Kinds of Systems Study
      4. Systems Engineering
      5. Structural Systems Theory, Electric Networks and Elastic Systems
      6. Mathematical Systems Theory as a System
      7. Other Kinds of System Study
      8. Elements of a Systems Theory
      9. Usefulness of our Concise Definition of Systems
      10. The Systems Analysis Approach
      11. The Fundamental Principle of Systems Work
      12. General and Special Properties of System Problems
      13. Systems, Subsystems, Parts, and Boundaries
      14. Structure Types of a System
      15. System Partitioning
      16. Systems Partitioning of Outer Boundary
      17. A Sketch of a Basic Theory of Systems Analysis
      18. The Suitable Number of Subsystems in a System
    2. Systems Algebra
      1. Algebraic Tools for Describing Systems
      2. Precedemce Operator of a System (or Graph)
      3. The Precdence Matrix of a System
      4. The Precendents of s set of Parts
      5. Use of the Precedence Matrix P to Determine the Precedents of a Set of parts
      6. Connections with a Linked Data Structure
      7. Matrix by Matrix Composition pn, n-th Precedents and Paths
      8. Succedence Matrix PT
      9. Generalization of the Precendence Concept
      10. A generalized Matrix by Vector Operation
      11. Generalized Matrices
      12. Matrix Operations as Processing of Data Structures
      13. Other Kinds of Algorithms for Processing Data Structures
      14. P11, the 1-dimensional Precendence Matrix
      15. P01 and P10, Precendence Matrices for Mixed 0-1 and 1-0 Dimension Respectively
      16. Relations between P01, P10, P11, and P00 Respectively
      17. Definition of E10, the Incidence Matrix
      18. Boundary Operations on a System and the Incidence Matrix
      19. Co-boundary Operation and Incidence Matrix
      20. The Coincidence Matrix M10
      21. Data Structure Representations of Incidence and Coincidence Matrices
      22. Illustrations of Boundary Operations in Accounting
      23. Built-up Systems and Gross Systems
      24. System Connections, Boundary Operation and Cycles
      25. Positional Operator for the System Graph
      26. Simple Paths and Closed Paths in a System Graph
      27. Transposed Positional Operator, Forward Positioning
      28. General Positioning
      29. Requirements Computation and Scheduling
      30. Determining the Boundary Operator from M10 and the Part Boundary Operator RT
      31. Boundary Operator for Generalized Systems
  2. Information Systems Theory
    1. Information Systems
    2. The Function of an Information System
    3. The Economic Quantity of Information and Processing
    4. Some Problems of Information Systems Design
    5. Precedence Relations between Information Sets in and Information System
    6. Data and Information Files
    7. Files, Computations, and Processes
    8. Effect of a Process Grouping
    9. File Consolidation
    10. System Design Computation Using Matrix Algebra
    11. File Storage Considerations
    12. File Organizations
    13. System Reliability
  3. Some Data Processing Problems
    1. Relation between a Process and its Files
    2. Influence of Word Structure

The approach was developed over some time before the mid-1970s and so reflects a relatively low-level focus that seems quaint in a modern context. However the material culminating in the chapter on System Design Computation is of enduring value. I believe Langefors died a few years before the turn of the century and there was both a final work by him, related work by colleagues in Regnecentralen and other organizations, and related work from unrelated sources.


TAIS is significant for several reasons. One is historical. The work was published shortly after the introduction of the concept of Software Engineering and before the emergence of OOP, Design Patterns, and other currents which came to represent the mainstream of of systems analysis and design practice.

Role in ai-integration.biz

TAIS is the theoretical foundation of the general approach to information systems development in ai-integration.biz.

Further Reading

¹ Lagefors, B. Fourth Edition, AUERBACH. 1973 ISBN 0-87769-151-7