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In a Social Impact context, the diminishing influence over time that a completed intervention will have on the presence of an outcome. For example, a training program may generate skills (outcome) which persist after the completion of the program. However the level of the outcome will diminish (people forget), and/or the influence of your program on the outcome level will diminish (relative to other influences like on-the-job experience). Drop-off is used to account for this when calculating the total value created over the full benefit period (see above). A fixed percentage is normally deducted from each year of outcome value.


See Change: Four factors to consider when evaluating outcomes