Feedback from the user trials affirms that AG hotkey improves chat responsiveness, thus enhancing chat spontaneity.Yahoo Messenger might be the best messaging app no one will use. Results from experimental trials show that an Affective Gesture (AG) approach improved IM chat spontaneity/response. A hybrid quantitative and qualitative approach was taken to enable data triangulation. It was developed with a novel user-defined hotkey implemented as a one-click context menu to "fast-track" text-gestures and emoticons. This thesis presents a text only IM system built on Session Initiation Protocol (SIP) and SIP for Instant Messaging and Presence Leveraging Extensions (SIMPLE). This is done without a major physical reconstruction of handheld devices. This thesis explores affective gesture mode on interface redesign as an input offering adaptation. Enhancement is achievable in a number of ways, such as input mechanism redesigning and input offering adaptation. To enhance input mechanisms for interactive text-based chat on mobile devices, there is a need to facilitate gesture input. Attaining some level of interaction naturalism requires improving synchronous communication spontaneity, partly achieved by enhancing input mechanisms. One element of interaction is gesture, seen as a natural way of conversing. There is a need to rubberise this plastic text messaging to improve co-presence for text communications thereby improving synchronous textual discussion, especially on handheld devices. Nevertheless, Instant Messaging (IM), a form of text communication is on the upward uptake both on PCs and on mobile handhelds. It is traditionally devoid of intonation, pitch, gesture, facial expression and visual or auditory cues. This interaction incoherency tends to make text communication plastic. Text communication is often perceived as lacking some components of communication that are essential in sustaining interaction or conversation.
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