Delphi vs. Wideband Delphi

Attribute	Delphi	Wideband Delphi
Process	Iterative process involving multiple rounds of feedback	Iterative process involving multiple rounds of feedback
Number of Experts	Usually a small group of experts	Usually a larger group of experts
Timeframe	Can take longer due to multiple rounds of feedback	Can be quicker due to wider range of experts
Confidence Levels	Experts provide individual estimates with confidence levels	Experts provide individual estimates with confidence levels
Consensus	Strives for group consensus on final estimate	Strives for group consensus on final estimate

Introduction

Delphi and Wideband Delphi are both estimation techniques used in project management to forecast the time, effort, and cost required for a project. While they share similarities, they also have distinct differences that make each method unique. In this article, we will compare the attributes of Delphi and Wideband Delphi to help project managers determine which technique is best suited for their specific needs.

Delphi Technique

The Delphi technique is a structured method used to reach a consensus forecast by gathering input from a group of experts. In this approach, experts provide their individual estimates anonymously, and a facilitator aggregates the responses to create a group estimate. The process typically involves multiple rounds of feedback until a consensus is reached. The Delphi technique is known for its ability to reduce bias and influence from dominant personalities within the group.

• Anonymous input from experts
• Facilitated by a neutral party
• Multiple rounds of feedback
• Reduces bias and influence

Wideband Delphi Technique

The Wideband Delphi technique is an extension of the traditional Delphi method that aims to streamline the estimation process by reducing the number of rounds of feedback. In Wideband Delphi, experts provide their estimates in a group setting, allowing for real-time discussion and collaboration. This approach is more efficient than the traditional Delphi method but may be susceptible to groupthink and bias from dominant personalities.

• Group setting for estimation
• Real-time discussion and collaboration
• Efficient estimation process
• Potential for groupthink and bias

Comparison of Attributes

When comparing Delphi and Wideband Delphi, several key attributes stand out. One of the main differences between the two techniques is the level of anonymity in the estimation process. In the Delphi technique, experts provide their estimates anonymously, while in Wideband Delphi, estimates are shared in a group setting. This difference can impact the accuracy and reliability of the final estimate.

Another important attribute to consider is the facilitation of the estimation process. In the Delphi technique, a neutral facilitator guides the process and ensures that all experts have an equal opportunity to contribute. In Wideband Delphi, the group setting may lead to less structured facilitation, potentially allowing dominant personalities to sway the final estimate.

Efficiency is also a key factor when comparing Delphi and Wideband Delphi. The traditional Delphi method involves multiple rounds of feedback, which can be time-consuming. In contrast, Wideband Delphi aims to streamline the estimation process by allowing for real-time discussion and collaboration. While this can lead to quicker results, it may also increase the risk of groupthink and bias.

Conclusion

In conclusion, both Delphi and Wideband Delphi are valuable estimation techniques that can help project managers make informed decisions about their projects. The Delphi technique is known for its ability to reduce bias and influence, while Wideband Delphi offers a more efficient estimation process. When choosing between the two methods, project managers should consider the level of anonymity, facilitation, and efficiency that best aligns with their project needs. By understanding the attributes of Delphi and Wideband Delphi, project managers can select the technique that will yield the most accurate and reliable estimates for their projects.