Answer: context border process
Explanation: the context border process and the system border process are the two processes needed to establish the system context which helps to separate the system from its environment and to highlight particularly, those parts which are relevant and affect the requirements of the system.
Where the system border helps determine which aspects will be covered by the new system (the systems scope) and which aspects are part of the environment, the context border determines the border of the context to the irrelevant reality by analysing which parts of the environment have a relationship with the new system such as external systems, existing processes, events and actions or legal definitions, stakeholders etc.