The Task 39 Phase 1 work programme was articulated around three work packages corresponding to key aspects of wind turbine noise. In each of these, a number of potential sub-tasks to be addressed were identified, and some of them were selected as collaborative work activities. The first work package (WP) focuses on Interdisciplinary Education and Guidance. WP 2 deals with physics of noise and technical aspects of wind turbine noise. WP 3 is concerned about the psychology of noise, including psycho-acoustic and human perception of wind turbine noise. Unfortunately, there has been no contributions to this part of the Task from specialists in this domain during the first phase of the task.

In Phase 2 of Task 39, the objective is to propose a work programme with a more balanced approach for addressing both engineering and socio-psychological aspects (see https://iea-wind.org/task39/t39-work-plan-and-objectives). This extension of Task 39 to a second Phase has been approved by the IEA Wind TCP Executive Committee (at ExCo 87 meeting, May 2021) and will be running from beginning of 2022 to end 2024.