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(b) KLM-GOMS stands for Keystroke-Level Model for Goals, Operators, Methods, and Selection rules. It allows designers to predict how long it will take a skilled user to execute a specific set of actions using a particular interface design. The standard set of operators are: Keying (K): for typing a key or clicking a control - 0.2s Pointing (P): pointing with a mouse to a target on a display - 1.1s Homing (H): home hands on keyboard or other input device - 0.4s Mentally Preparing (M): think before doing an action - 1.35s Responding (R): time a user must wait for a response Once you determine the operators, you need to apply the following ru for mental operations before calculating the time. Rule 0: Add Ms in front of all Ks and all Ps that point to commands. Rule 1: Change PMK to PK to remove fully anticipated Ms. ● Rule 2: Eliminate any Ms in the middle of strings that are part of cognitive unit (a contiguous sequence of typed characters). • Rule 3: Delete Ms before consecutive terminators. Rule 4: Delete Ms that are terminators of commands. Rule 5: Delete overlapped Ms, i.e., overlaps an R (a delay).

(b) KLM-GOMS stands for Keystroke-Level Model for Goals, Operators, Methods, and Selection rules. It allows designers to predict how long it will take a skilled user to execute a specific set of actions using a particular interface design. The standard set of operators are: Keying (K): for typing a key or clicking a control - 0.2s Pointing (P): pointing with a mouse to a target on a display - 1.1s Homing (H): home hands on keyboard or other input device - 0.4s Mentally Preparing (M): think before doing an action - 1.35s Responding (R): time a user must wait for a response Once you determine the operators, you need to apply the following ru for mental operations before calculating the time. Rule 0: Add Ms in front of all Ks and all Ps that point to commands. Rule 1: Change PMK to PK to remove fully anticipated Ms. ● Rule 2: Eliminate any Ms in the middle of strings that are part of cognitive unit (a contiguous sequence of typed characters). • Rule 3: Delete Ms before consecutive terminators. Rule 4: Delete Ms that are terminators of commands. Rule 5: Delete overlapped Ms, i.e., overlaps an R (a delay).

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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i) Using KLM-GOMS, list out the necessary actions and identify the 
operators that will be used to calculate the time required to take a 
skilled user to change their preferred country using the interface 
shown in figure 1 Assume that the currently displayed country is the 
“United Kingdom”, and the user needs to select “United States” from 
the country/region dropdown and choose “Español” from the language 
dropdown. Assume no scrolling is involved in either dropdown control. 
Clicking the “Go to site” button at the end will apply the change.

 


(ii) Using your solution from (i), apply the rules for mental operations 
where applicable and use your final formula to make a prediction of 
the time it will take a skilled user to complete the task.

(b) KLM-GOMS stands for Keystroke-Level Model for Goals, Operators, Methods, and Selection rules. It allows designers to predict how long it will take a skilled user to execute a specific set of actions using a particular interface design. The standard set of operators are: • Keying (K): for typing a key or clicking a control - 0.2s Pointing (P): pointing with a mouse to a target on a display - 1.1s • Homing (H): home hands on keyboard or other input device - 0.4s Mentally Preparing (M): think before doing an action - 1.35s Responding (R): time a user must wait for a response Once you determine the operators, you need to apply the following rules for mental operations before calculating the time. Rule 0: Add Ms in front of all Ks and all Ps that point to commands. Rule 1: Change PMK to PK to remove fully anticipated Ms. Rule 2: Eliminate any Ms in the middle of strings that are part of a cognitive unit (a contiguous sequence of typed characters). Rule 3: Delete Ms before consecutive terminators. Rule 4: Delete Ms that are terminators of commands. Rule 5: Delete overlapped Ms, i.e., overlaps an R (a delay).
Transcribed Image Text:(b) KLM-GOMS stands for Keystroke-Level Model for Goals, Operators, Methods, and Selection rules. It allows designers to predict how long it will take a skilled user to execute a specific set of actions using a particular interface design. The standard set of operators are: • Keying (K): for typing a key or clicking a control - 0.2s Pointing (P): pointing with a mouse to a target on a display - 1.1s • Homing (H): home hands on keyboard or other input device - 0.4s Mentally Preparing (M): think before doing an action - 1.35s Responding (R): time a user must wait for a response Once you determine the operators, you need to apply the following rules for mental operations before calculating the time. Rule 0: Add Ms in front of all Ks and all Ps that point to commands. Rule 1: Change PMK to PK to remove fully anticipated Ms. Rule 2: Eliminate any Ms in the middle of strings that are part of a cognitive unit (a contiguous sequence of typed characters). Rule 3: Delete Ms before consecutive terminators. Rule 4: Delete Ms that are terminators of commands. Rule 5: Delete overlapped Ms, i.e., overlaps an R (a delay).
2. Below shows a form provided on a website for the user to choose the delivery country, the currency the prices on the website are displayed in, and the language the website content is displayed in. This question focuses on the language selection functionality. To select their preferred language, the user first selects a country and then the language options are displayed, see figure 1 below. The language choices available to the user when they change their country to United Kingdom, United States, or Canada are provided below. If the user selects "United Kingdom", they have only one language option - English. ● If the user selects "United States", they have two language options English and Español. If the user selects "Canada", they have two language options - English and Français. X Country Selector X United Kingdom (£CBP) Language options available Language options available Country Selector Select Country / Region United Kingdom (£) Select Language English English Co to site →→ United Kingdom (£CBP) Select Country / Region United States ($) Select Language English English Español Figure 1 Form for Users to Change Preferred Language Co to site →
Transcribed Image Text:2. Below shows a form provided on a website for the user to choose the delivery country, the currency the prices on the website are displayed in, and the language the website content is displayed in. This question focuses on the language selection functionality. To select their preferred language, the user first selects a country and then the language options are displayed, see figure 1 below. The language choices available to the user when they change their country to United Kingdom, United States, or Canada are provided below. If the user selects "United Kingdom", they have only one language option - English. ● If the user selects "United States", they have two language options English and Español. If the user selects "Canada", they have two language options - English and Français. X Country Selector X United Kingdom (£CBP) Language options available Language options available Country Selector Select Country / Region United Kingdom (£) Select Language English English Co to site →→ United Kingdom (£CBP) Select Country / Region United States ($) Select Language English English Español Figure 1 Form for Users to Change Preferred Language Co to site →
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