Any place where you need a run-time value to construct a particular dependency Abstract Factory is the solution.
Usually when you encounter this situation, you need to revisit your design and determine if you are mixing your stateful/data objects with your pure services. In most (not all) cases, you will want to keep these two types of objects separate.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.