Which of the following is used to build consensus through rounds of anonymous surveys?

A Pareto chart is a quality tool that ranks causes of defects or problems by frequency to identify the most significant issues; it is not used for building consensus.

The Delphi technique is a structured forecasting and consensus-building method where experts respond to successive rounds of anonymous questionnaires. After each round, a summary of responses is shared, and experts revise their answers, converging toward consensus without the social pressure or anchoring bias of face-to-face discussion.

A Monte Carlo simulation is a quantitative risk analysis technique that uses probability distributions and repeated random sampling to model project outcomes, not a consensus-building process.

A Gantt chart is a schedule visualization tool showing tasks over time; it has no role in gathering expert opinions or building consensus.