A lot of data is collected through the coaching itself. Since our goal is to help employees achieve their goals, we always deal with the obstacles on the path. Those obstacles are both internal and environmental (leadership, culture, processes).
Beyond that, if we have a specific target, we can also ask employees. Due to having a high trust relationship with the employee, we get high-quality data.
Of course, we always ask the employee's permission to share our findings with senior management and it's done anonymously. They often are happy that we do it, since, even in especially sensitive cases, they appreciate our service of anonymously conveying the message up top.