DOCUMENTATION OF DECISION-AIDING SOFTWAREThe HIPO diagram identification numbers and figure numbers...
Transcript of DOCUMENTATION OF DECISION-AIDING SOFTWAREThe HIPO diagram identification numbers and figure numbers...
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DOCUMENTATION OFDECISION-AIDING SOFTWARE:
INFER SYSTEM SPECIFICATIONDECISIONS AND DESIGNS INC.
Dorothy M. AmeyPhillip H. Feuerwerger
Roy M. Gulick
June 1979
V- DL,..-Oq QAM
DEES D ADVSAC D PROJCT AGENC
Office of Naval Research * Engineering Psychology Programs
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777 P.-.-.-.- -- -
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DOCUMENTATION OF DECISION-AIDING SOFTWARE:V INFER SVSTEU SPECIFICATION
by
Dorothy M. Amey, Phillip H. Feuerwerger, and Roy M. Gulick
Sponsored by
Defense Advanced Research Projects AgencyARPA Order 3469
June 1979
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CONTENTS
Page
FIGURES ii
1.0 INTRODUCTION 1
1.1 Purpose of the System Specification 1
1.2 References 1
1.3 Terms 21.3.1 INFER 21.3.2 Terms 2
2.0 DESIGN DETAILS 3
2.1 Background 3
2.2 General Operating Procedures 3
2.3 System Logical Flow 3
2.4 HIPO Documentation 6
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FIGURES
Figure
2-1 LEGEND OF HIPO SYMBOLS5
2-2 OVERALL DIAGRAM AND VISUAL TABLE
- OF CONTENTS 7
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INFER SYSTEM SPECIFICATION
1.0 INTRODUCTION
1:1 Purpose of the System Specification
The INFER System Specification is a technical document
written for software development personnel. Together with
the INFER Functional Description, the System Specification
guides the software development effort by identifying the
functional requirements and by providing structured logic
diagrams that depict the flow, control, and processing of
VW information within the system.
The System Specification is generic documentation
intended to guide and facilitate the preparation of thelanguage-specific and computer hardware-specific program
documentation and coding that are necessary to implement and
operate INFER at an installation.
1.2 References
1.2.1 IBM, HIPO--A Design Aid and Documentation Tech-
nique. Technical Publication GC20-1851-0.
White Plains, New York: IBM, October 1974.
1.2.2 Amey, Dorothy M.; Feuerwerger, Phillip H.;
Gulick, Roy M. Documentation of Decision-Aiding....-:.Software: INFER Functional Description. McLean,
Virginia: Decisions and Designs, Inc., June
1979.
1.2.3 Amey, Dorothy M.; Feuerwerger, Phillip H.;
Gulick, Roy M. Documentation of Decision-Aiding
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Software: INFER Users Manual. McLean, Virginia:Decisions and Designs, Inc., June 1979.
1.3 Terms
1.3.1 INFER - The name of the system, INFER, is an
abbreviation for inference, reflecting the logical process
supported by the software.
i,11.3.2 HIPO - The specification uses the standard Hier-
archy plus Input-Process-Output (HIPO) diagramming techniqueto depict the structural design and logical flow of thesystem. A legend explaining the HIPO diagramming symbols isincluded. Reference 1.2.1 provides a complete description
of the HIPO documentation technique.
2
4..
*. . . .
. . . . . . . . . . ..- . .,. .
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2.0 DESIGN DETAILS
2.1 Background
" Systems development personnel should refer to the INFER
Functional Description, reference 1.2.2, in conjunction with
the documentation contained in this specification. The
Functional Description details the inference models imple-
mented by INFER and discusses the specific functions that
the software must perform. In addition, systems development
personnel may wish to refer to the INFER User's Manual,
Reference 1.2.3.
- 2.2 General Operating Procedures
INFER is a menu-driven system. That is, the system is
designed to interact with the user by presenting a sequen-
*' tial hierarchy of menus and asking the user to respond by
selecting one option from the current menu. If the user
does not select one of the menu options, the system displays
the previous menu. In this manner, the user moves up and
down the hierarchy, as desired. Whenever data entry is
required as a result of option selection, the system spe-
cifically requests the data and specifies the format.
The system is also designed to be generally forgiving
of procedural errors by the user.
2.3 System Logical Flow
INFER is a hierarchically structured, modular software
system. The system structure and logical flow lends itself
to presentation in the form of HIPO diagrams, which are
contained in this document.
3. -" .3 .!
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The main purpose of the HIPO diagrams is to provide, ina pictorial manner, the complete set of modular elementsnecessary to the operation of INFER including all input,
"output, and internal functional processing. This is done by*: displaying input items to the process step which uses them,* defining the process, and showing the resulting output of
the process step.
The HIPO documentation diagrams are designed and drawnin a hierarchical fashion from the main calling routines tothe detail-level operation/calculation routines. Extended
written descriptions are given below a HIPO diagram wheneverit is deemed necessary.
A complete explanation of the symbolic notation used in
the HIPO diagrams appears in reference 1.2.1. An abbre-viated legend for the symbols used in this specification ispresented in Figure 2-1. Note that:
a. External system subroutines are depicted partlyin the Process block and partly out. Internal
subroutines are shown within the Process block.
b. Overview diagrams show general inputs and outputsonly, whereas detail/subroutine-level diagrams
show specific input/output tables and/or displays.
c. Rectangular boxes inside the Input/Output blockareas are generally used to denote single dataitems. Two or more boxes are grouped to show thatseveral data items are input/output.
d. Rectangular boxes inside the Process block indi-cate repetitive subprocesses.
-. 4
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Figure 2-1
LEGEND OF HIPO SYMBOLS
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7 :-7:
The HIPO diagrams appear in the next section, which
completes the System Specification.
2.4 HIPO Documentation
The HIPO diagram identification numbers and figure
numbers used in this section stand alone; i.e., they start
with 1.0, increase hierarchically, and are independent of
the numbering scheme used to this point in this document.
Figure 2-2 is a system structure chart and represents
the overall program logic flow in a visual table of contents.The Visual Table of Contents diagram shows the hierarchical
structure, the functional description labels, and the diagram
(chart) identifiers of functions of INFER.
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LABELS
EVENT NAMES OUTCOME NAMES for events (-N arrays)
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NODE STRUCTURE TABLE* A•
* J Number of outcomes for node 3NI- Number of associated outcome probabilities
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The number of influencing nodesspecified (node type)
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PROBABILITY TABLES
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H IPO Figure 2.1
INFER MODEL DEFINITION TABLES (continued)
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