As handheld and portable devices get smaller and more powerful, designers are faced with a daunting task. Not only must their next device design be smaller than the previous generation, they often must also integrate additional functionality. Beyond the matter of technology integration at the board level is the issue of presenting that functionality in a manner best suited to the user. Especially when integrating systems in a single device, one must keep in mind things such as heft, ergonomics, and haptics. Heft is the feeling the weight, density, and balance an item gives you when you first pick it up, a kind of "mouth feel" for the hand. A device with heft has good balance and solid construction, creating a feeling of "tightness" when held.
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