Training needs analysis form - Who is supposed to fill the TNA form?

Good morning guys, Hope everyone is doing great. I have a query about Who is supposed to fill the TNA form?
1-The manager: Because he is the one sees the employee performance, and can judge what kind of T & D he needs?
2-The employee himself fill it, as he is the best one knows his weaknesses?
Thanks & waiting for your inputs
Samuel

What's stopping the manager and the employee from completing the TNA form? Its not as if filling by one nullifies or reduces the impact of completing by the other.
In fact, any TNA done correctly should incorporate a number of elements - particularly the employee and their immediate supervisor/manager.
There is no harm is completing TNA forms just like a 360 degree evaluation form. In fact, why not make the TNA an integral element of the 360 assessment itself?