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This bias may exist but after a person uses the

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This bias may exist, but after a person uses the product, that perception will alter. The user'sconceptual model of the product will improve as a result of their good interaction experience.This increases the likelihood that the user will purchase the product or recommend it to a friend.Change is more difficult when the conceptual model is robust. Mac and Windows PCs are anexcellent illustration of a skewed mental model.2.Variants of categories & interactive modesAll of the ways a user can communicate or interact with a computer system are referred to asInteraction Type. The idea is related to human-computer interaction (HCI) or has origins incomputing media, such as workstations or desktop computers. Outside of the computer medium,however, these ideas maintain some of their descriptive value.The sorts of interaction modes described in HCI textbooks, such as Shneiderman (1997) and Preeceet al. (1994), are generally command language, form filling, menu selection, and direct manipulation.Language of Command (or command entry)The oldest form of interaction was command languages, which are still in use today, butmostly on Linux/Unix operating systems. A command prompt is shown in the followingscreencast; in this example, the user is logged into the (mail) server and may utilize theserver capabilities by inputting commands.For example, when interacting and using server functions by entering commands on Linuxoperating system
Figure 10: Example when use command entry on LinuxForm fillNon-experts are the target audience for interactive form-filling (also known as "fill-in").Form-filling interfaces were (and still are) very effective for mundane jobs, clerical labor, andtasks that need a lot of data entering.Below are some instances of form fill:
Figure 11: Example for form filling contactMenu SelectionA menu is a collection of options presented on a screen, where selecting and executing one(or more) options causes the interface's state to change (Paap and Roske-Hofstrand, 1989, asdescribed cited in Preece et al. 1994). The user picks a command from a preset selection ofcommands displayed in the menu and sees the result using a menu selection based system.Menu elements are frequently grouped in pull-down or pop-up menus to conserve screenspace.An example of a menu selection is shown below:The flow menu allows us to choose and perform actions on a flow that is presently open oron a node that is present in the flow.
Figure 12: Example for MenuDirect ManipulationBen Shneiderman used the phrase "direct manipulation" to characterize a form ofinteraction in his keynote speech at the NYU Symposium on User Interfaces (Shneiderman1982) and more clearly in Shneiderman (1983). The Sutherlands sketchpad may be tracedback to certain 'direct' software interactions (Sutherland 1963). The concept of "directmanipulation of items of interest" (Shneiderman 1983: p. 57) is captured by the term "directmanipulation of objects of interest," which means that things of interest are represented asdistinct objects in the user interface and controlled directly.

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