134 10 Project Cost Management
While the stage of analysis strongly depends on the intrinsic nature of the
project, the evaluation stage exploits a set of standard methods to assess the following
aspects of a project/investment:
●
Net income (the difference between revenues and costs)
●
Profitability (the ratio between all the revenues occurred and the costs sustained)
●
Risk (intended in this context in an economical, not a technical sense)
The most popular methods for evaluating the financial performances of a project
are as follows:
1. Net Present Value (NPV) method for evaluating income
2. Profitability Index (PI), also known as Value Investment Ratio
3. Payback method for limiting risk when estimating cash flows
4. Internal Rate of Return (IRR) method for evaluating the level of risk when esti-
mating the actualisation rate
In the following pages we will briefly describe these four methods, presenting at
the end an example of a compared evaluation.
The Net Present Value (NPV) is the difference between positive (gains) and
negative (costs) cash flows, both of which are actualised. This value is the net gain
that can be ascribed to the project as if it were already available, in other words, at
its present value. It therefore depends, as well as on the amount of forecasted profits
and losses, also on the interest rate used to actualise the sum (since the coefficient
is always lower than 1, actualisation detracts a certain amount of the future gain to
its current value: for this reason, the flows obtained are discounted). A company
will choose those projects having a positive NPV, taking however into account the
links existing between the various projects (in order to avoid, for instance, product
cannibalism), the consequences of path dependency (i.e. constraints on future
choices brought about by the decisions made on current investments) and the
limited availability of resources.
The Profitability Index (PI) measures the ratio between positive (gains) and
negative (costs) cash flows, both of which are actualised, i.e. discounted; the nega-
tive cash flows (i.e. the denominator) often coincide with the initial investment,
whereas successive costs are deducted from the gains at the numerator. It must be
noted that a good PI does not necessarily imply a good NPV. Since PI = R/C =
(C + NPV)/C = 1 + NPV/C, where R are the revenues and C the costs, there could
be a modest value of NPV but an excellent PI if the costs sustained were very lim-
ited; on the other hand, a very high value of NPV could be obtained at remarkable
costs, and therefore the PI would be low. When applying the PI, attention must
be paid to the data considered: the value of the index changes if all the costs and
revenues are considered, or the positive and negative periodic flows only (a periodic
flow is the difference between revenues and costs in a certain period of time). The
acceptance criterion for a project, according to this method, is that the PI value is
greater than 1; given a certain sum to invest (in the event of a limited capital), the
project chosen is that with the greatest PI.