Limitations and Perspectives on Use of E-Services in by Hanne Westh Nicolajsen, Morten Falch

By Hanne Westh Nicolajsen, Morten Falch

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Accesses (Card, PIN, AlMnumber, Accountnumber,.... Legend Figure 7 Entity-relationship model for portion of an ATM. e. they strive to be as independent of the device as possible. e. the sequencing of actions) of particular implementations. Functional data models concentrate on the data processing which is strictly necessary for some process to function in a given domain. For example, in order to get cash from an ATM, a user has to be validated and to have enough money in the account (Figure 8) and these things have to take place in sequence.

The designer, with extensive knowledge in human-computer interaction, cognitive psychology, software engineering, organisational theory and some basic artistic experiences, should never be eliminated from the domain specific design process. Analysis of information utilisation aims at identifying instances of information and their use in the work process. Relevant information is also automatically obtained for establishing and validating the datamodel. Instances of information relate to the information concept of the user, and are formulated in terms of information sets normally used in a work situation.

The dialogue is specified using some kind of high level language. Designing user interfaces using a tool box at this level is tedious and time consuming and requires programming skills. Development with a UIMS is abstract for a potential end-user without computer knowledge. General critique on UIMSs is that they generate to much overhead, that they do not support the main application or the communication with the main application, and that they do not support direct manipulated interfaces directly, being based on logical models of the user interface.

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