Context diagram A diagram of the product and its surroundings (user groups and external systems). It shows the scope of the product. It is useful to outline a context diagram early in the project and keep it updated during analysis.
Event list & function list An event is something that requests a system to perform some function. Usually an event arrives with some data telling the system what to do. Since an event causes the system to perform a function, we can make a similar list of the functions that the system can perform.
Event list & function list Domain events arrive to the domain from the surroundings ( sometimes called business events or triggers). Product events arrive at the product from the domain.