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As with most consumer goods, automobiles have become increasingly dependent on semiconductor technology to deliver the features that end users want. From the first electronic engine controls in the 1970s to the latest antilock braking systems, CD players and theft protection devices, options most popular with consumers require integrated circuitry and computing power. In many cases -- antilock braking systems and air bags, for example -- consumer demand quickly transfers electronics-based systems from the options category onto the list of standard features. In the past, a new electronic feature required new integrated circuit design and a separate box to house components. Today, though, integration at the component, sub-system and system levels allows automotive designers to combine functions, reducing the space required to house the electronics. Because it allows several features to operate from the same components, integration often results in lower costs.