Here are some examples of data you could use to calculate deadweight for different
kinds of outcome.
Outcome Benchmark indicator
Reduction in reoffending rates among National average reoffending rate among
young ex-offenders (16-24 yrs) taking part 16-24-year-olds
in a rehabilitation programme
Improvement in educational outcomes for Educational outcomes for children in the
young people in high-quality residential residential care population as a whole
care homes
Increase in number of long-term Average rate at which the long-term
unemployed gaining a job after unemployed come off benefits in the
participating in an employment training same region
programme
Decreased crime in a borough after a Change in crime rate in a borough with
borough-wide initiative increasing the similar socio-economic profile, but not
number of police on the streets subject to a specific crime-reduction
initiative
Whether you want to understand your impact, or be more credible in your discussions
with stakeholders, one advantage of calculating deadweight is that it weights the
Stag social value towards outcomes for stakeholders where deadweight is low. For what are Stag
sometimes called ‘hard to reach’ groups, deadweight is likely to be lower than for other
e
groups. For example, the likelihood of someone who has been long-term homeless
e
 
moving into employment without support is low; the likelihood is that much, if not all, of
the change is due to the support received. This means that if the two groups experienced
similar outcomes the impact would be higher for the harder to reach group.
As deadweight increases, your contribution to the outcome declines. When deadweight
is high this may mean that the outcome is no longer material to your analysis.
Deadweight will be measured as a percentage and then that percentage of the outcome
is deducted from the total quantity of the outcome.
Displacement is another component of impact and is an assessment of how much of
the outcome displaced other outcomes. This does not apply in every SROI analysis but
it is important to be aware of the possibility. Two examples show where displacement
is most relevant:
1. An evaluation of a state-funded street lighting programme in one borough found a
reduction in crime; however, the neighbouring borough reported an increase in crime
during the same period. It is possible that the reduced crime was simply displaced.
A guide to Social Return on Investment 
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