Human-Computer Interaction: Communication, Cooperation, and Application Design

By Hans-Jörg Bullinger; Jürgen Ziegler | Go to book overview

Display and Internal Operation Flow as shown in Table 1. In addition to the conventional DFD development guideline, the Process and Display is used to represent a display interface of a process component. Note that interfaces will be created for each Process and Display function and will be used in ESTD later.

The Internal Operation Flow, drawn in a bold dashed line, represents the information flow between users and Process and Display via internal operations (to be discussed later). The volume of information flow is the essential factor that causes hight memory load.


Table 1 The Extended Functions of Extended Data Flow Diagram (EDFD)
Name Symbol Explanation DFD
Process and Display a display symbol on the left upper corner of
process indicate a display interface required
no
Internal Operation 14 = 15 = 16 a dashed line indicate the internal operations
required
no

The second stage is to develop an ESTD which is altered from STD by adding three functions: Accumulated Display Interface, External Operation Flow, and Exclusive Operator (please refer to Table 2). The Accumulated Display Interface (ADI) is an interface accumulated memory load of Non- Accumulated Display Interface (NDI), which is just a simple interface.

The External Operation evaluates the user memory loads of both the Accumulated Display Interfaces and Non-Accumulated Display Interfaces. The external operations of each interface will be shown within each interface block.

The Exclusive Operator function is dedicated to constraining the looping of user operations by limiting the entry and exit following the same interface so that the users will not get lost in the loop.


Table 2 The Extended Functions of Extended State Transition Diagram (ESTD)
Name Symbol Explanation DFD
Accumulated Display
Interface (ADI)
a gray triangular mark on the left
upper corner of NDI indicates the
main interface for users
no
External Operation description of external operations no
Exclusive Operator a circle with cross line indicates
the constraint of entry and exit of
interface
no

-54-

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