Plastic is a synthetically-produced non-metallic substance. It can be molded into various forms and hardened for use. Plastic molded products can be seen everywhere. A few examples are jars, protective caps, tubes, handles, toys, bottles, boxes, accessories and tools. The keyboard and mouse you are using are of molded plastic. The plastic components of the chair you sit on are of molded plastic. A slurry is formed by mixing a plaster (usually gypsum or calcium sulfate), with talc, sand, asbestos, sodium silicate, and water. This slurry is sprayed on the polished surfaces of the halves of the pattern. In fewer than 15 minutes the slurry hardens to form the mold. The mold halves are extracted from the pattern and dried in an oven. QuickTime can be used with MMD. Animation, video clips and sound can thus be incorporated in a document. Additionally, copying, pasting, recording, playing and cutting of dynamic media are possible. QuickTime is utilized in educational software. There, special effects such as physics experiments and chemical reactions are better simulated at the click of an icon, than with hypertext documents for computer-aided instruction. It is used in business presentations to animate information such as sales figures creeping up (or down) in real time or presenting data in slide shows. Scientific and engineering data recorded by remote monitoring equipment can be replayed through QuickTime allowing researchers to study events of interest such as tornadoes. The question of how well a design fits the user's needs can be resolved by prototyping. Through
rapid prototyping designers obtain information from users about the systems necessary functionality, user assistance needs, an optimum sequence of operations, and the appearance of the user interface. Whatever the tasks the users wish to perform (task analysis, information-gathering, etc), it is important that the proposed system have the necessary functionality. Information about the sequence of operations can tell the designers what users need to interact successfully with the system An outcome of the
rapid prototyping process must be a system that provides both high functionality and ease of use.
