Impact Assessment is a means of measuring the effectiveness of organisational activities and judging the significance of changes brought about by those activities. It is neither Art or Science, but both. Impact assessment is intimately linked to Mission, and, in that sense, ripples through the organisation.
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Impact Assessment (IA) simply defined is the process of identifying the future consequences of a current or proposed action. The “impact” is the difference between what would happen with the action and what would happen without it.