Impact Evaluators (IEs) are a modular system for coordinating work by measuring, evaluating, and retrospectively rewarding the impact achieved towards specified valuable objectives.
An Impact evaluator can be generally described by the tuple of objects
$$ Impact\ Evaluator\ IE = \{r, e, m, S\} $$
where
r is the reward function
e is the evaluation function
m is the measurement function on S
S is the scope of the IE
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