Benefit/Cost Ratio is calculated by dividing the total present value benefits by the total present value costs. Where costs exceed benefits, the ratio will be less than 1 and break-even will not be reached. The same applies for marginal costs and marginal benefits. That is, when comparing alternatives it is sometimes easier to compare the marginal costs and marginal benefits of alternative choices. Where marginal costs exceed marginal benefits, the alternative is not optimal.
Applying this "marginal" cost/benefit analysis can also allow us to clearly see the law of diminishing returns in action. Beyond some point, each additional software feature or unit of hardware capacity (at almost always more cost) yields less and less output. Further, software features and hardware capacity do not necessarily equate to any organizational or societal benefit. In, the book, "Benefits Management: Delivering Value from IS & IT Investments
John and Elizabeth suggest that rather than starting with the features and functions of the technology or system, agencies should start with what it is that's causing the organization to consider the investment and what the project is expected to deliver. "It is only when this and the required change management actions have been identified that the IS and IT required should be assessed, leading to a technology specification that is 'sufficient to do the job'." Or, "Good enough for government work."
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