Know how to identify which features or elements of a negotiation which are less important to one or other parties in the negotiation and therefore understand that these items can be traded.
In a negotiation, items may be traded so that each party can achieve their goals whilst the other party makes least sacrifice. If items in a negotiation have great value to one party and hardly any value to the other then it is useful to discover what these items are. Items traded can enable each party to get thing from the negotiation.
The knowledge named 'Indetify trading items' is considered to be quite important.
In addition, the knowledge is thought to be quite complex and quite difficult to learn, it is learned with an even study experience balance, and is quite specialised knowledge.
Opinion is that it is fairly justifiable knowledge.