Project Input-Output Model
Updated 2026-09-11
INTRODUCTION
English translation pending.
CORE DEFINITION
The project input-output model defines inputs as the resources a project consumes, outputs as the results it delivers, and efficiency as the ratio of output to input. Its core claim is that project value is measured by that ratio, and that both sides must be quantified on the same basis of time and scope before any comparison is meaningful. The model underpins ROI and cost-benefit analysis, and it requires that hidden costs such as communication and rework be counted alongside financial input.
SCAFFOLDING EFFECT
Reduce cognitive load
- Define the terms first: fix what counts as input and output in time and scope. - Compute the ratio: convert both sides to comparable units and calculate efficiency. - Compare to decide: rank projects or phases and rework the weakest bottlenecks.
Anchor fast decisions
Project value is measured as output divided by input, and both sides must be quantified on the same basis; efficiency reflects how well resources convert into results and forms the basis for prioritization and review.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Input%E2%80%93output_modelverified
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