Editing Smart device (section)

== Form factors ==
In 1991, [[Mark Weiser]] proposed three basic forms for ubiquitous system devices: tabs, pads and boards.<ref name="Weiser">{{cite journal|last=Weiser|first=Mark|authorlink=Mark Weiser
|title=The Computer for the Twenty-First Century|year=1991|journal=[[Scientific American]]|volume=265|issue=3 |pages=94–104|doi=10.1038/scientificamerican0991-94}}</ref>
* ''Tabs'': accompanied or wearable centimetre sized devices, e.g., [[smartphones]], [[smart cards]]
* ''Pads'': hand-held decimetre-sized devices, e.g., [[laptops]]
* ''Boards'': meter sized interactive display devices, e.g., horizontal [[surface computer]]s and vertical [[smart board|SMART board]]s.
These three forms proposed by Weiser are characterized by being macro-sized, having a planar form and by incorporating visual output displays. These were also envisioned more as information appliances. If each of these three characteristics is relaxed, this range can be expanded into a much more diverse and potentially more useful range of ubiquitous computing devices.<ref name="Poslad">{{cite book
  | last = Poslad
  | first = Stefan
  | title = Ubiquitous Computing Smart Devices, Smart Environments and Smart Interaction
  | publisher = Wiley
  | year = 2009
  | isbn = 978-0-470-03560-3
  | url = http://www.elec.qmul.ac.uk/people/stefan/ubicom/index.html
  | access-date = 2009-07-04
  | archive-date = 2012-02-15
  | archive-url = https://web.archive.org/web/20120215005731/http://www.elec.qmul.ac.uk/people/stefan/ubicom/index.html
  | url-status = live
  }}</ref>