138 Personal Content Experience: Managing Digital Life in the Mobile Age Similarly, the devices accessible nearby could affect the need for adaptation. For instance, instead of a device’s tiny screen, one might show a video clip on a larger screen by connecting the mobile device to a TV set. In this case, even though the screen resolution of the device itself might justify content adaptation, the intended usage suggests otherwise. To summarize, content adaptation is far from a trivial issue, yet in many cases it affects the perceived usability and user experience a great deal. 5.2.6 Locating the Desired Piece of Content To enjoy a piece of content, the user needs to fi rst locate it. Theoreti- cally, there are two methods for fi nding a desired piece of information: either by browsing, or by searching (although browsing can also be understood as a form of visual searching). Currently, searching is often 9 associated with search engines, such as Google, that are used for fi nding material on the Web. However, as the amount of content stored in local devices rapidly increases, search tools for personal content will be increasingly required. One such tool is Google Desktop that indexes all local content upon installation on a PC and, once installed, all subsequently added content is also indexed. Then, it can be used as a keyword-based search tool for locating not only remotely, but also locally stored content. As far as fi le systems are concerned, searching in its simplest form is based on fi le names: you provide some keywords, and the system scans through the fi le system, comparing the keywords to the fi le names. Each hit is considered a result. This approach has severe limitations, especially related to fi le man- agement versus content management (section 3.1). First, fi le names do not usually convey any information related to the content of the fi le, or do so only partially. Worse, many devices and applications that are capable of creating personal content apply an automatic naming scheme to all created fi les (such as a prefi x and an index number). “image001.jpg” and “imag002.jpg” are as usable to the fi le system as are “mum and kids.jpg” or “my biggest fi sh ever.jpg”. After all, the fi le name is used primarily for internal identifi cation by the fi le system. File names are just one form of document descriptors. This leads 10 us to keyword searching, where a set of keywords are associated with 9 http://www.google.com/ 10 That is, metadata. For more discussion on metadata, refer to Chapter 4.