Why Scope Expands: II

As we've seen, scope tends to expand, rather than contract. In Part I of this exploration, we briefly examined cognitive biases that lead us to avoid changes that would tend to contract scope. In this Part II we explore cognitive biases that lead us to favor proposals that tend to expand scope.

Confirmation bias

In the grip of confirmation bias we tend to favor information that confirms our beliefs and preconceptions. Although it operates when we're evaluating information, its most important effects for scope creep relate to its influence on information gathering. To the extent that confirmation bias influences them, those decision makers who have a preference for expanding the scope of an effort will tend to seek proposals that expand that effort's scope. This might include, among others, those decision makers who want to limit the total number of efforts underway, those who want to "piggy back" a favored capability on an effort already underway, and those who seek to enhance their power by expanding the scope of efforts they lead. For more, see "Scope Creep and Confirmation Bias," Point Lookout for March 12, 2014.

Ambiguity effect

The ambiguity effect is the human tendency to prefer options for which the probability of a favorable outcome is known fairly well, compared to options for which the probability of a favorable outcome is less known. When two projects, A and B, are both in trouble, and A is led by someone known to the decision makers, while B is led by someone less well known, the arguments contained in a proposal by A's leader to acquire B are likely to hold sway over B's counter-arguments, even when there are some doubts about A's likelihood of success and no evidence suggesting doubts about B's likelihood of success.

Bias blind spot

The bias blind spot [Pronin 2002] creates in humans a tendency to believe that they are not affected by cognitive biases. Scope expansion might be
inevitable. Instead of trying
to prevent it, we might do
better by learning
to exploit it.It causes decision makers to fail to compensate for cognitive biases in the decision process. An example of a cognitive bias compensation might be a review of the set of options under consideration, to ensure that scope-contracting approaches receive due consideration.

The anchoring effect

This bias causes us to assign too much importance to the first available piece of information. With regard to scope creep, that information might be an early proposal, or market research, or a senior management directive. For example, in the latter case, management might solicit proposals for cost reduction. Decision makers then might tend to become anchored on cost reduction, which could lead them to favor consolidating several projects, failing to even consider the possibility that any cost savings from consolidation might be surpassed by revenue advantages arising from earlier completion by continuing to operate those projects separately.

Most important, perhaps, is the Optimism Bias — the tendency to overestimate favorable and pleasing outcomes. Any proposal that manages to come up for a final decision is more likely to be accepted if it promises success.   First issue in this series   Top    Next Issue

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Footnotes

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