This does not state however how the washing should be

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This does not state, however, how the washing should be carried out, whether the machine should be capable of heating the water prior to washing, whether rinsing or drying, or both, are to be done by the machine, and if so by what method, and what should the proportion be between automatic functioning and manual supervision. A functional analysis of this kind obviously affects the design of the machine, its complexity, its appearance, and its price. Sometimes functional aspects are detachable, and usage can be left to the customer’s decision. A steam iron is a case in point. The additional function of
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56 dampening the cloth when required, prior to or during ironing, is incorporated in the steam iron, the main duty of which is to iron the cloth. The customer can decide whether and when to exploit this characteristic of the apparatus. There is a trend to offer functional versatility of the product, thereby increasing the range of applications and sometimes combining several tools in one. A food mixer, for example, allows for a large number of attachments to be added for a variety of duties. Basically the mixer housing contains a power unit and a speed regulator, but it has to be designed so as to serve all the attachments, and the customer has to decide and define for himself the functional scope to be compatible with his needs, his taste, and his pocket. Household power-tool sets are designed on very much the same principle: The hand drill is the basic unit, and with attachments it can become a table drill, a lathe, a polisher, a hedge cutter, etc. Versatility of production machinery may quite often result in substantial savings in floor space and capital expenditure, and this may become one of the fundamental factors affecting design policy. Another example of versatility in design is shown in Figure 6.2. 5.3.2.2 Operational Aspect After determining the functional aspect, the operational aspect has then to be considered. Not only must the product function properly, it must be easy to handle and simple to operate. Sometimes it has to be adaptable to various operational conditions, and very often it is subjected to varying degrees of skill of potential operators. The designer’s problem becomes all the more critical with the trend for increased versatility because this characteristic implies using basic attachments as elements for building suitable combinations for specific purposes. This requires a certain amount of operator intelligence and skill, which increases with the complexity of the machine. The scarcity of skill is a prohibitive limitation in this respect on the product designer. 5.3.2.3 Aesthetic Aspect In what way does the appearance of a product affect its design? In most cases, where the functional scope, durability, and dependability have already been defined, the aesthetics are mainly concerned with molding the final shape around the basic skeleton. This molding of shape may very often be severely limited in scope, and what finally emerges is sometimes termed a ‘functional shape’. The view
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