Basic Impact Assessment At Project Level Page 10

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Figure 4
The Conventional Model of the Impact Chain
Mediating Processes
Outcomes for the agent
Behaviours and
and/or other agents
practices over
Agent
a period of time
The difference
between
Impact
outcomes is
the impact
Modified behaviours
Modified outcomes for the
and practices over a
agent and/or other agents
Agent
period of time
Mediating Processes
Program
Intervention
The complexity of such chains provides the assessor with a range of choices about which
link (or links) to focus on. It is useful to distinguish between two main approaches with
regard to which link(s) in the chain to focus on. For convenience, these are termed the
‘intended beneficiary’ and the ‘intermediary’ approaches.
The intended beneficiary approach, building on the ideas of conventional evaluation, seeks
to get as far down the impact chain as is feasible (in terms of budgets and techniques) and
to assess the impact on intended beneficiaries (individuals or households).
The
intermediary approach focuses purely on the beginning of the chain and in particular on
changes in project outputs or institutional outreach and sustainability. The link between the
intermediary process and the ultimate impact is often much wider than can be reasonably
assessed for any individual project. One may therefore wish to do an ‘intended beneficiary’
assessment infrequently on a broad basis, to evaluate the policy assumptions underlying
the design of individual interventions. For each intervention, one would only assess
intermediary impacts.
4.2
Units of assessment
Following on from the design of a model of the impact path comes the choice of the unit(s)
of assessment (or levels of assessment).
Common units of assessment are the
household, the enterprise or the institutional environment within which agents operate.
The relative advantages and disadvantages of different units of assessment are
summarised in Box 1.
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