5.1 Projecting into the future
The first step in calculating your ratio is to project the value of all the outcomes
achieved into the future. In step 3.3, above, you decided how long an outcome would
last. Using this, you will now need to:
• set out the value of the impact (from step 4.4) for eac h outcome for one time period
(usually 1 year);
• copy the value for each outcome across the number of time periods it will last (as
recorded in the Duration column on your impact map); then
• subtract any drop-off you identified (step 4.3) for each of the future time periods after
the first year.
In the worked example this was done using Excel. We have not included an example
of a blank Excel sheet because different people have different approaches to Excel and
because we have found that standard approaches cannot be easily used for different
situations. It is easier to set up your own spreadsheet using the worked example and
the description in the text as a guide.
1
The worked example – drop-off and impact projected in future years
Look at the impact map for Wheels-to-Meals on page 104: the yellow section shows
you how the columns for impact have been completed.
If we take the line for GP practice nurse group sessions, the duration is 5 years and
the drop-off 10%. The 10% is an estimation of the likelihood that residents will use
the knowledge they gain less as time goes on as they forget the sessions.
So the calculation Wheels-to-Meals used to work out the effect of drop-off on the
projected impact into future years goes like this:
Impact in year 1 = £1,539.00
Stag Stag
This is the same as the impact calculated at the end of the project. We only account
e
for the outcomes in the year after the activity and only calculate drop-off in
e
following years.
Impact in year 2 yr1 impact less drop-off
£1,539.00 less 10%
£1,539.00 x 0.9 = £1,385.10
Impact in year 3 yr2 impact less drop-off
£1,385.10 less 10%
£1,385.10 x 0.9 = £1,246.59
Impact in year 4 yr3 impact less drop-off
£1,246.59 less 10%
£1,246.59 x 0.9 = £1,121.93
1 See
www.thesroinetwork.org for information on developments in software that will assist in completing this stage.
A guide to Social Return on Investment
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