dido:public:ra:1.4_req:2_nonfunc:30_usability:efficiency
Differences
This shows you the differences between two versions of the page.
| Next revision | Previous revision | ||
|
dido:public:ra:1.4_req:2_nonfunc:30_usability:efficiency [2020/11/20 18:58] nick created |
dido:public:ra:1.4_req:2_nonfunc:30_usability:efficiency [2021/06/11 14:52] (current) char |
||
|---|---|---|---|
| Line 1: | Line 1: | ||
| - | ====== Efficiency Metrics ====== | + | ====== 4.3.6.2 Efficiency Metrics ====== |
| [[dido:public:ra:1.4_req:2_nonfunc:30_usability| Return to Usability]] | [[dido:public:ra:1.4_req:2_nonfunc:30_usability| Return to Usability]] | ||
| + | ===== About ===== | ||
| Efficiency is measured in terms of the time it takes to complete a task from when the task is initiated to when it is successfully completed. The units used to record the time must be uniform for all tasks (i.e., milliseconds, seconds, minutes, etc). | Efficiency is measured in terms of the time it takes to complete a task from when the task is initiated to when it is successfully completed. The units used to record the time must be uniform for all tasks (i.e., milliseconds, seconds, minutes, etc). | ||
| Line 7: | Line 8: | ||
| The time taken to complete a task can then be calculated by simply subtracting the start time from the end time: | The time taken to complete a task can then be calculated by simply subtracting the start time from the end time: | ||
| - | <m>Task Time = {End Time} – {Start Time}</m> | + | <m>Task Time = {End Time-Start Time} </m> \\ |
| There are two ways to calculate Efficiency: | There are two ways to calculate Efficiency: | ||
| Line 14: | Line 15: | ||
| * Overall Relative Efficiency | * Overall Relative Efficiency | ||
| - | ===== Time-Based Efficiency ===== | + | ==== Time-Based Efficiency ==== |
| - | [[dido:public:ra:1.4_req:2_nonfunc:30_usability| Return to Top]] | + | [[dido:public:ra:1.4_req:2_nonfunc:30_usability:efficiency | Return to Top]] |
| In this calculation, the quotient from the division of the success of a task (either one or zero) divided by the time to accomplish a task is an indicator of the efficiency of the task. For example, if a tasks was not successful, then the success of the task is zero and the efficiency is zero. If the task is successful and it takes one minute to accomplish the task, then the efficient is one (i.e., 1/1). If it takes two minutes to accomplish the task, then the efficiency is one half (i.e., 1/2 = .5). | In this calculation, the quotient from the division of the success of a task (either one or zero) divided by the time to accomplish a task is an indicator of the efficiency of the task. For example, if a tasks was not successful, then the success of the task is zero and the efficiency is zero. If the task is successful and it takes one minute to accomplish the task, then the efficient is one (i.e., 1/1). If it takes two minutes to accomplish the task, then the efficiency is one half (i.e., 1/2 = .5). | ||
| Line 21: | Line 22: | ||
| To calculate the Time-Based Efficiency for all tasks and all users, the following equation applies: | To calculate the Time-Based Efficiency for all tasks and all users, the following equation applies: | ||
| - | + | <color white>o</color> <m>{Time Based Efficiency} = {sum{i=1}{R}{} sum{j=1}{N}{} {n_{i,j}} / {t_{i,j}} } / {N*R}</m> \\ | |
| - | <m>{time Based Efficiency} = {sum{i=1}{R}{} sum{j=1}{N}{} {n_{i,j}} / {t_{i,j}} } / {N*R}</m> | + | <color white>o</color> \\ |
| + | \\ | ||
| + | \\ | ||
| Where: | Where: | ||
| * **N** : The total number of tasks (goals) | * **N** : The total number of tasks (goals) | ||
| Line 47: | Line 49: | ||
| Placing the above values in the equation: | Placing the above values in the equation: | ||
| - | <m>{time Based Efficiency} = {{({1/1} + {1/2} + {1/3} + {0/6})} / { 1*4}} = {0.46 goals / sec}</m> | + | <color white>o</color> <m>{Time Based Efficiency} = {{({1/1} + {1/2} + {1/3} + {0/6})} / { 1*4}} = {0.46 goals / sec}</m> \\ |
| - | + | \\ | |
| - | + | \\ | |
| - | ===== Overall Relative Efficiency ===== | + | ==== Overall Relative Efficiency ==== |
| - | [[dido:public:ra:1.4_req:2_nonfunc:30_usability| Return to Top]] | + | [[dido:public:ra:1.4_req:2_nonfunc:30_usability:efficiency | Return to Top]] |
| The overall relative efficiency uses the ratio of the time taken by the users who successfully completed the task in relation to the total time taken by all users. The equation can thus be represented as follows((UI Designer, __Efficiency__, Accessed 19 November 2020, [[http://ui-designer.net/usability/efficiency.htm]] | The overall relative efficiency uses the ratio of the time taken by the users who successfully completed the task in relation to the total time taken by all users. The equation can thus be represented as follows((UI Designer, __Efficiency__, Accessed 19 November 2020, [[http://ui-designer.net/usability/efficiency.htm]] | ||
| )): | )): | ||
| - | <m>{Overall Relative Efficiency} = {{sum{i=1}{R}{} sum{j=1}{N}{} {n_{i,j}}*{t_{i,j}} } / {sum{i=1}{R}{} sum{j=1}{N}{} {t_{i,j}}}} * {100%}</m> | + | <color white>o</color> <m>{Overall Relative Efficiency} = {{sum{i=1}{R}{} sum{j=1}{N}{} {n_{i,j}}*{t_{i,j}} } / {sum{i=1}{R}{} sum{j=1}{N}{} {t_{i,j}}}} * {100%}</m> \\ |
| + | \\ | ||
| + | \\ | ||
| + | \\ | ||
| + | \\ | ||
| Justin Mifsud<sup>[[dido:public:ra:1.4_req:2_nonfunc:30_usability#fn__1|1]]</sup> provides an excellent example of how for calculating Overall Relative Efficiency. | Justin Mifsud<sup>[[dido:public:ra:1.4_req:2_nonfunc:30_usability#fn__1|1]]</sup> provides an excellent example of how for calculating Overall Relative Efficiency. | ||
| Line 74: | Line 79: | ||
| Placing the above values into the equation yields the following: | Placing the above values into the equation yields the following: | ||
| + | <color white>o</color> <m>{Overall Relative Efficiency} = ({((1*1)+(1*2)+(1*3)+(1*6))} / {(1+2+3+6)})*100 = 50%</m> \\ | ||
| + | <color white>o</color> \\ | ||
| + | \\ | ||
| + | \\ | ||
| + | \\ | ||
| + | \\ | ||
| + | \\ | ||
| + | ===== DIDO Specifics ===== | ||
| + | [[dido:public:ra:1.4_req:2_nonfunc:30_usability:efficiency | Return to Top]] | ||
| + | |||
| + | : <wrap hi><color red> To be added/expanded in future revisions of the DIDO RA </color></wrap> | ||
| + | |||
| + | /**=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- | ||
| + | /* To add a discussion page to this page, comment out the line that says | ||
| + | ~~DISCUSSION:off~~ | ||
| + | */ | ||
| + | ~~DISCUSSION:on|Outstanding Issues~~ | ||
| + | ~~DISCUSSION:off~~ | ||
| - | <m>{Overall Relative Efficiency} = ({((1*1)+(1*2)+(1*3)+(1*6))} / {(1+2+3+6)})*100 = 50%</m> | ||
dido/public/ra/1.4_req/2_nonfunc/30_usability/efficiency.1605916694.txt.gz · Last modified: 2020/11/20 18:58 by nick
