5.2 USER INTERFACE DEVELOPMENT using barcode creation for jdk control to generate, create datamatrix 2d barcode image in jdk applications. Microsoft .NET Compact Framework A software 2d Data Matrix barcode for Java application is started by a person, another software application, a hardware application, or a combination thereof. A demon program may invoke a server application at a particular time; this is an example of a software application being invoked by another software application. The operating system itself is an application that may be started by a hardware/software driven application, turning the computer on, providing power to the CPU, and allowing the initialization software permanently stored on the hardware to invoke an operating system.

Excluding arti cially intelligent systems, all software applications, at some point and perhaps through a long line of succession, are either started or scheduled to start by a person a user.. 5.2 User Interface Development The mechanism through which j2ee Data Matrix barcode users access a software application is referred to as the user interface. Though today the user interface to a software application brings to mind a mouse, a keyboard, and a monitor, this is only a small subset of possible interfaces to computing systems. In fact, in the realm of mobile computing, the mouse, the keyboard, and the stationary monitor often do not ful ll the requirements.

Yet, most of the software methodologies, techniques, and tools that we use today are intended for software that runs or is used by a PC. More importantly, the developers think and design with the PC framework embedded in their minds as the end user. The rst task at hand is to make a complete paradigm shift away from this type of thinking and design methodology.

Let us take a step back and look at the important aspects of user interface development. First, there are the human factors. The way it is used has a great impact on the utilization of any computing system.

Though de ning human factors in one sentence is a dif cult task, it can be de ned as the set of those concerns qualifying the interaction of the user with the software system. Often, subsets of human factors considerations such as usability are referred to individually; however, human factors remains an encompassing term that refers to all those concerns that describe the quality of the interaction of a user with a system. Nearly all touchy-feely considerations of user interface design fall within the purview of human factors.

We will take an in-depth look at human factors in mobile application design later in this chapter. Although human factors considerations are of utmost importance, to deliver the most ef cient mobile application, the application user interface must suit the condition of the user. For example, a voice user interface is better suited for an application designed for nding directions while driving than a graphical user interface because drivers cannot safely read or view the directions while driving though they can hear the directions safely.

Therefore, mobile applications must be designed with multiple channels in mind: We will not limit ourselves to just voice or just graphical user interfaces. We will discuss mobile graphical user interfaces in 6 and mobile voice user interfaces in 7. We will call this multichannel user interface development and take a preliminary look at it later on in this chapter but cover the topic comprehensively in 8.

In this chapter, we will lay down the taxonomy for decomposition of user interfaces so that we can build on them in the next three chapters. This taxonomy will be critical in understanding how to build generic interfaces that can be specialized to a wide range of devices using multiple user interface channels. Let us start with the human factors aspects of mobile development.

. 5.2.1 Human Factors Dix et al. de ne human facto Data Matrix 2d barcode for Java rs, often referred to as ergonomics, as the study of the physical characteristics of the interaction: how the controls are designed, the physical environment in which the interaction takes place, and the layout and physical qualities of the screen [Dix et al. 1998].

This view is a bit biased toward GUIs. Later in the same text, the authors discuss other types of user interfaces. Regardless, their de nition tells us that human factors is a very qualitative study.

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