This calculator estimates the proportion of the British population who would be unable to use a product or service because of the demands that it places on the users’ capabilities.
Using this calculator involves assessing the demands that a task, product or service places on a range of user capabilities. If you have not been trained in assessing demands, then please go to the Framework section in the Inclusive Design Toolkit.
This Exclusion Calculator Lite v2.1 is free for personal and educational use. For commercial use, please contact firstname.lastname@example.org to enquire about licensing the Exclusion Calculator Pro, which also offers additional functionality, such as the ability to assess task sequences.
The University of Cambridge shall not be liable for any indirect or consequential damage, injury (whether loss of profit, loss of business, depletion of goodwill or otherwise), costs, expenses or other claims for consequential compensation whatsoever (howsoever caused) which arise out of or in connection with the use of this tool.
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This ‘freely available’ version of the exclusion calculator allows you to assess one task, using UK population data from 1997.
More advanced versions are available, subject to licence. These can enable functionality such as:
All licence fees are spent on further development of the calculator, and all future developments are available to all license holders.
Please contact us for more details at firstname.lastname@example.org
One or more demands
outside survey range
Size of target population:
Population statistics are derived from a reanalysis of the 1996/97 Disability Follow-up-survey, as described in Waller’s journal paper.
If you are presenting results produced by this tool in any media, you should include the following citation and disclaimer:
These results have been estimated using the Exclusion Calculator Lite v2.1, which is freely available from calc.inclusivedesigntoolkit.com. The results have not been verified or endorsed by the University of Cambridge and are subject to a disclaimer at cedc.tools/disclaimer.
Note: Your current assessment will be deleted.
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An task must have at least one item in it
Note: The file’s correct extension will be automatically added.
Would you like to update the title of the assessment to reflect the filename?
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To navigate between the different parts of this calculator click on the bar at the top of the screen. Your assessment will remain stored when you click on this bar. However, it will be lost if you click back, or refresh the page, or navigate away from this page.
To perform a demand assessment, click on Assess in the bar at the top of the screen.
The target population can be set using the drop-down menus provided. The exclusion figures will then be calculated as a proportion of this population.
The assessment title and details can be changed by clicking on them.
It is recommended that you break down the use of the product or service into a series of task steps (using a task analysis). Each task should be small enough to be manageable when considering the demands involved in it.
The set of tasks is shown on tabs just below the assessment title and details. An assessment starts with just one task. Additional tasks can be added by clicking on Add task. A task name can be changed by clicking on it and tasks can be removed by clicking the symbol on the tab.
Move to a task by clicking on its tab. If there are more than 5 tasks, then you can use the and symbols at the start and end of the set of tabs to navigate through the list of tasks.
The assessment for a task involves assessing the demands it places on various user capabilities. If you have not been trained in assessing demands, then please go to the Framework section in the Inclusive Design Toolkit to find out more.
Click on a capability to assess the demand on that capability. Compare the level of capability required to do the task with the capability required to do the tasks on the scale (note that Vision is a bit different). Take Hearing for example. A task may require more hearing capability than understanding loud speech in a quiet room, but less hearing than using a telephone without special adaptations. The assessor would click on the Hearing scale in between the icons for Understand loud speech in quiet room and Use telephone with special adaptations for hearing impairment.
Assessing Vision is slightly different. It can be assessed in two ways: using simulation glasses or by comparing against standard text sizes. Assessing with simulation glasses is more accurate but requires purchasing these Cambridge Simulation Glasses. You can swap between the two methods by clicking on the tabs above the Vision scale.
When the demands on a capability have been set, the exclusion due to that capability is shown as a bar next to the capability name. Some capabilities (e.g. Thinking) have multiple scales within them. The exclusion will only be shown once demands are set on all of these scales.
This free version of the calculator analyses a single task. An advanced version of the calculator has been designed to analyse multiple tasks within a user journey. To purchase a licence for the advanced version, please contact us at firstname.lastname@example.org
At any point in an assessment, you can see the full exclusion results by clicking on Results in the bar at the top of the screen.
Results are shown by default as bar graphs. To move to a table format for the results, click on the icon.
To download all the results as a CSV file, click on the button Save results to CSV file underneath the total exclusion figures.
An assessment can be saved at any time by clicking File access on the bar at the top of the screen. This page also allows you to upload a previously saved assessment to continue work on it, or to start a new blank assessment.
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