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CSC 8570 -- USI. Class Meeting 4 September 13, 2006. Notations for Actions. Actions for a keyboard and graphical input device (GID) include: Tap: pressing and immediately releasing a key. Implemented with a momentary contact (spring-loaded) switch.

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Csc 8570 usi

CSC 8570 -- USI

Class Meeting 4

September 13, 2006


Notations for actions

Notations for Actions

Actions for a keyboard and graphical input device (GID) include:

  • Tap: pressing and immediately releasing a key. Implemented with a momentary contact (spring-loaded) switch.

  • Click: Position the GID and tap the GID button.

  • Double click: Position the GID and tap the GID button twice quickly, without repositioning.


Notation for actions 2

Notation for Actions (2)

  • Keystroke Level Model

    • K[ ], a keystroke. E.g. K[b] means tapping lower case b

    • P, pointing. E.g. positioning the GID

    • H, homing. E.g. moving from keyboard to GID or GID to keyboard

    • M, mental processing

    • R, responding


Notations for action 3

Notations for Action (3)

  • What does the description

    To create a right justified paragraph, use Control + .

    ask you to do?


Notations for action 4

Notations for Action (4)

More actions:

  • Press and hold a key

  • Release a key

    • But on what signal or input?


Notations and actions 5

Notations and Actions (5)

  • Raskin/Beck

    • Press and hold: bi

    • Release: bh

    • Tap: bibh, shortened to bih or just b

    • Release on signal: bh[ ]

    • Note that key names are italicized

  • Examples:

    • Create an upper case M: ShiftimimhShifth, shortened to Shiftimihh


Notations for action 6

Notations for Action (6)

  • Examples (continued)

    • Distinguish between Enter and E n t e r Enter is the name of a key and E n t e r is short for Eihnihtiheihrih

    • bih[20] gives a string of bs

    • CtrliAltiDelihhh brings up the Task Manager


Clock setting

Clock Setting

  • Set the clock one hour earlier, the common action at the end of daylight savings time.

  • GOMS model

    • Goal: stated above

    • Operations:

    • Methods:

    • Selection Rule:


Bad interfaces

Bad Interfaces

  • Detectable with GOMS model?


Interfaces and widgets

Interfaces and Widgets

What can a user do? When? Where?

How effectively?

  • Catalog of interface actions

  • Catalog of interface widgets


Modeling actions

Modeling Actions

  • Task analysis: temporal issues

  • GOMS analysis: method issues

  • Keystroke level: operator issues


Task analysis

Task Analysis

  • Describes the process the user chooses to reach a goal in a specific domain

  • Hierarchical description, typically

  • Task modeling systems

    • GOMS (?)

    • ConcurTaskTrees

    • UAN (User Action Notation)


Research project

Research Project

  • Hypotheses (tonight)

  • Independent variables (tonight)

  • Dependent variables (tonight)

  • Bibliography (next week)

  • Background

  • Formal setting (let’s talk)


Theory collection

Theory Collection

Visual processing

  • Three-stage visual system

  • Preattentive processing theory

  • Structured object perception theory (Biederman)

  • Scientific color theory (CIE)


Theory collection 2

Theory Collection (2)

Motor Behavior Models

  • Hick-Hyman Law: choice time

  • Keystroke-Level Model: error-free task completion time

  • Three-state model of graphical input (Buxton)

  • Fitts’ Law: human movement

  • Guiard’s Model of Bimanual Skill


Theory collection 3

Theory Collection (3)

Task analysis

  • Hierarchical model using ConcurTaskTrees


Research project 2

Research Project (2)

  • Experimental design

    • Between subjects

    • Within subjects

  • Sources of bias

  • Sources of subjects

  • Logic of conclusions


Research project 3

Research Project (3)

  • Institutional Review Board (IRB)

  • IRB form

  • Informed consent


Research project 4

Research Project (4)

  • Short presentation

    • One spokesperson

    • Five minutes

    • Hypothesis, variables, initial experimental design

    • PowerPoint or transparencies


Next time

Next Time

  • Read Carroll, Chapter 6. Note that this chapter describes several “spaces.”

  • Create a concept map that shows the relationships between these “spaces.” Make sure your map is labeled with your name so that it can be submitted.

  • Submit a revised IRB form and bibliography.

  • Research project presentation


Research team meetings

Research Team Meetings


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