8b0e774b_racle__a_k_a___Duane_s_World____Task
[Junior] Basic knowledge, often tries to implement abstract classes resulting in errors. [Senior] Understands when to prescribe abstract classes as prototypes and how to create concrete classes that may be instantiated based on the abstract classes. [Task] 
Abstract vs Concrete
Technoracle (a.k.a. "Duane's World")
Task