By conducting anonymous surveys on regular basis.
Need to value their people.
They should run some criteria for performance measurement than coercive treatment.
Team respect their work and interactions to deliver the deliverables on time.
By putting fair interview panel NOT managers who hire their favourites or friends.
They haven't developed a single good product in last 10 years for oilfield. Just selling the same products by increasing activities and some of the activities are now 80%.