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ReferencesNavigation arrowAuthorsNavigation arrowDavid F. Loricchio

Publication statistics

Pub. period:1989-1993
Pub. count:5
Number of co-authors:1



Co-authors

Number of publications with 3 favourite co-authors:

James R. Lewis:1

 

 

Productive colleagues

David F. Loricchio's 3 most productive colleagues in number of publications:

James R. Lewis:22
 
 
 
Jun 18

“ Computer programs emerge as the outcome of complex human processes of cognition, communication and negotiation, which serve to establish the meaningful embedding of the computer system in its intended use context. ”

-- Floyd, 1992, p. 24

 
 

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David F. Loricchio

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Publications by David F. Loricchio (bibliography)

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1993
 
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Loricchio, David F. (1993): A Comparison of Keyboard-Integrated Pointing Devices. In: Proceedings of the Fifth International Conference on Human-Computer Interaction 1993. pp. 1075-1078.

“The IBM Design Center in Boca Raton studied two integrated pointing devices for a portable computer keyboard. The first device was a trackball located on the right side of the typing keys. The second device was a roll bar located below the spacebar on the keyboard. The roll bar rolled up and down and could slide to the left or right. Twenty-one participants used the roll bar, the keyboard-integrated trackball, and an off-keyboard trackball to edit text. Then they wrote their comments about the devices and ranked the devices in order of preference. Participants edited significantly more characters with the trackballs than with the roll bar. Participants significantly preferred the trackballs over the roll bar. While the integrated trackball was clearly better than the roll bar, participants identified a number of problems with both devices.”

© All rights reserved Loricchio and/or Elsevier Science

1992
 
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Loricchio, David F. (1992): Key Force and Typing Performance. In: Proceedings of the Human Factors Society 36th Annual Meeting 1992. pp. 281-282.

“The IBM Design Center in Boca Raton studied the operating-point key force for a portable computer keyboard. Alden, Daniels, and Kanarick (1972) report that typists prefer operating-point key forces of between 25 and 150 grams. We compared different key forces that fell within the range recommended by Alden et al. The only difference between the keyboards we studied was the amount of force required to activate the keys. The first keyboard (58 keyboard) required 58 grams of force to activate the keys. The second keyboard (74 keyboard) required 74 grams of force to activate the keys. Sixteen skilled typists used both keyboards to enter text. Input speed was significantly faster on the 58-gram keyboard. A significant number of typists preferred the 58-gram keyboard. The results suggest that the optimal key force for portable computer keyboards is less than 74 grams.”

© All rights reserved Loricchio and/or Human Factors Society

 
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Loricchio, David F. (1992): A Comparison of Three Pointing Devices: Mouse, Cursor Keys, and a Keyboard-Integrated Pushbutton. In: Proceedings of the Human Factors Society 36th Annual Meeting 1992. pp. 303-305.

“The IBM Design Center in Boca Raton studied an integrated pointing device for a personal computer keyboard. The device, a pushbutton, is a flat, round button that tilts and moves the cursor in the direction of tilt. We wanted to know if this device would be acceptable to computer users. Twelve participants used the pushbutton, a mouse, and the cursor movement keys to select targets and edit text. Participants without previous mouse experience hit significantly more targets with the pushbutton than with the mouse. Participants with previous mouse experience performed significantly better on both tasks with the mouse, and preferred the mouse over the pushbutton and the cursor keys. Several participants said that the pushbutton was too sensitive and difficult to control. The results suggest: 1. The pushbutton tested in this study would not be acceptable to users; 2. The pushbutton operation could be more accurate if the force-to-motion mapping were improved.”

© All rights reserved Loricchio and/or Human Factors Society

1991
 
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Loricchio, David F. and Lewis, James R. (1991): User Assessment of Standard and Reduced-Size Numeric Keypads. In: Proceedings of the Human Factors Society 35th Annual Meeting 1991. pp. 251-252.

“As technology improves, portable computers become smaller and more compact. A clear design challenge is to provide a system that is as compact as possible without degrading system usability. The keyboard is still the primary input device for compact computers. Previous research has indicated that reduced key spacing adversely affects skilled typing. Therefore, a portable computer system should provide a keyboard with full-sized keys in the primary typing area. The purpose of this study was to determine if reducing key size and spacing adversely affects the usability of a numeric keypad. Skilled keypad operators compared a standard-size numeric keypad to two keypads that had reduced center-to-center key spacing. One of these keypads achieved its reduction primarily by reducing the key spacing. The other reduced both key size and spacing. (Note that the small changes in key size and spacing have little effect on the overall device dimensions of a numeric keypad.) Operators typed numbers faster with and preferred the standard keypad over the keypad with both reduced key size and key spacing. If a numeric keypad is offered as part of a portable computer, every effort should be made to provide full-sized keys. If reduced key spacing is unavoidable, wide keys are preferable to narrow keys.”

© All rights reserved Loricchio and Lewis and/or Human Factors Society

1989
 
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Loricchio, David F. (1989): Preference and Performance Differences for Three Syntax Diagrams. In: Proceedings of the Third International Conference on Human-Computer Interaction 1989. pp. 174-178.

“Syntax diagrams used in existing microcomputer software manuals are compared to a simpler diagram developed for this study. Computer users examined the diagrams and ranked them according to how easy they were to read and understand. Then they used only one diagram to select correct commands from a list. Computer users without programming experience preferred the simpler diagram to the existing diagrams. Computer users with programming experience preferred all diagrams about the same. The number of errors made in selecting commands from a list was somewhat lower for groups using the simpler diagram although this difference was not statistically significant.”

© All rights reserved Loricchio and/or Lawrence Erlbaum Associates

 
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Changes to this page (author)

29 Jun 2007: Modified
28 Jun 2007: Modified
26 Jun 2007: Modified
26 Jun 2007: Modified
26 Jun 2007: Added

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URL: http://www.interaction-design.org/references/authors/david_f__loricchio.html

Publication statistics

Pub. period:1989-1993
Pub. count:5
Number of co-authors:1



Co-authors

Number of publications with 3 favourite co-authors:

James R. Lewis:1

 

 

Productive colleagues

David F. Loricchio's 3 most productive colleagues in number of publications:

James R. Lewis:22
 
 
 
Jun 18

“ Computer programs emerge as the outcome of complex human processes of cognition, communication and negotiation, which serve to establish the meaningful embedding of the computer system in its intended use context. ”

-- Floyd, 1992, p. 24

 
 

Featured chapter

Read the fascinating history of Wearable Computing, told by its father, Steve Mann

Read Steve's chapter !

 
 

Latest books

The Social Design of Technical Systems: Building technologies for communities
by Brian Whitworth and Adnan Ahmad

 
Start reading

The Encyclopedia of Human-Computer Interaction, 2nd Ed.
by Mads Soegaard and Rikke Friis Dam

 
Start reading
 
 

Help us help you!

 
 
 
 
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