Calculating exclusion for user journeys

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.

Terms of use

This Exclusion Calculator Lite v2.1 is free for personal and educational use. For commercial use, please contact edc-toolkit@eng.cam.ac.uk 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.

About us

This calculator was produced by the Cambridge Engineering Design Centre, as part of the ID‐3 Inclusive Design Consortium run by the Centre for Business Innovation.

Upgrade

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:

Assess a user journey of multiple tasks.
Load, save and export results.
Use different versions of the source population data, which have been re-profiled to account for UK demographic changes for 2016 and 2025, and for other years on request.
Use different versions of the population data, which have been re-profiled to account for demographic changes for other territories on request.
Perform exclusion calculations within Microsoft Excel.

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 edc-toolkit@eng.cam.ac.uk

Download Exclusion Calculator Pro 2-8

Note this Excel version will only perform exclusion calculations if you purchase and enter a valid license code.

You may also want to download the Reference manual,

Total exclusion:

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.

Task(s)

Save results to CSV file

Save graph

View graph of all data broken down by capability

Save graph

Load an assessment from a previously saved file or save current assessment to file.

All saved files will have an .ecd file extension.
When saving a file with some internet browsers, you may not be prompted to select the location of the saved file.

Delete current assessment and create new assessment.

It is recommended you save a copy of your current assessment by selecting Save current assessment before starting a new assessment.

Contact us

This calculator was produced by the Cambridge Engineering Design Centre, as part of the ID3 consortium championed by the Centre for Business Innovation.

Help

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.

Assess

To perform a demand assessment, click on Assess in the bar at the top of the screen.

Target population

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 premium bit needs writing

Assessment title

The assessment title and details can be changed by clicking on them.

Tasks

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.

Demand assessments

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 edc-toolkit@eng.cam.ac.uk

Viewing results

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

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.

Note: File saving does not currently work with the Mac internet browser Safari. To save files on a Mac platform, you should use Chrome or Firefox internet browsers.

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Exclusion Calculator Lite v2.1