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The six operators of the KLM can be reduced, but this decreases the accuracy of the model. If this low of an accuracy makes sense (e.g. “back-of-the-envelope” calculations) such a simplification can be sufficient.<ref>{{cite book|last1=Card|first1=Stuart K|last2=Moran|first2=Thomas P|last3=Newell|first3=Allen|title=The Psychology of Human-Computer Interaction|date=1983|publisher=L. Erlbaum Associates Inc|___location=Hillsdale|isbn=978-0898592436|pages=[https://archive.org/details/psychologyofhuma00stua/page/296 296]|ref=34|url=https://archive.org/details/psychologyofhuma00stua/page/296}}</ref>
While the existing KLM applies to desktop applications, the model might not fulfill the range of mobile tasks,<ref>{{cite book|last1=Li|first1=Hui|last2=Liu|first2=Ying|last3=Liu|first3=Jun|last4=Wang|first4=Xia|last5=Li|first5=Yujiang|last6=Rau|first6=Pei-Luen Patrick|title=Extended KLM for mobile phone interaction: a user study result|journal=CHI EA '10 CHI '10 Extended Abstracts on Human Factors in Computing Systems|date=2010|publisher=ACM|___location=New York|isbn=978-1-60558-930-5}}</ref> or as Dunlop and Cross <ref>{{cite journal|last1=Dunlop|first1=M.|last2=Crossan|first2=A.|title=Predictive Text Entry Methods for Mobile Phones|journal=Personal Technologies|date=2000|volume=4|issue=2–3|pages=134–143|doi=10.1007/BF01324120}}</ref> declaimed KLM is no longer precise for mobile devices. There are various efforts to extend the KLM regarding the use for mobile phones or touch devices. One of the significant contributions to this field is done by Holleis, who retained existing operators while revisiting the timing specifications. Furthermore, he introduced new operators: Distraction (X), Gesture (G), Initial Act (I).
While Li and Holleis <ref>{{cite book|last1=Holleis|first1=P.|last2=Otto|first2=F.|last3=Hussmann|first3=H.|last4=Schmidt|first4=A.|title=Keystroke-level model for advanced mobile phone interaction|journal=CHI '07: Proceedings of the SIGCHI Conference on Human Factors in Computing Systems|pages=1505|date=2007|doi=10.1145/1240624.1240851|isbn=9781595935939|citeseerx=10.1.1.192.2364}}</ref> both agree that the KLM model can be applied to predict task times on mobile devices, Li suggests further modifications to the model, by introducing a new concept called operator blocks. These are defined as "the sequence of operators that can be used with high repeatability by analyst of the extended KLM.”.<ref>{{cite book|last1=Li|first1=Hui|last2=Liu|first2=Ying|last3=Liu|first3=Jun|last4=Wang|first4=Xia|last5=Li|first5=Yujiang|last6=Rau|first6=Pei-Luen Patrick|title=Extended KLM for mobile phone interaction: a user study result|journal=CHI EA '10 CHI '10 Extended Abstracts on Human Factors in Computing Systems|date=2010|publisher=ACM|___location=New York|isbn=978-1-60558-930-5|page=3521}}</ref> He also discards old operators and defines 5 new mental operators and 9 new physical operators, while 4 of the physical operators focus on pen-based operations.
Rice and Lartigue <ref>{{cite book|last1=Rice|first1=A.D.|last2=Lartigue|first2=J. W.|title=Touch-Level Model ( TLM ): Evolving KLM-GOMS for Touchscreen and Mobile Devices Categories and Subject Descriptors|journal=ACM SE '14 Proceedings of the 2014 ACM Southeast Regional Conference Article No. 53|pages=1–6|date=2014|doi=10.1145/2638404.2638532|isbn=9781450329231}}</ref> suggest numerous operators for touch devices together with updating existing operators naming the model TLM (Touch Level Model).
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