* Each process has an owneran '''owner'''* Each process has a unique ID ('''PID''')* Processes keep their PID for their ''PID'' for their '''entire life'''.* Usually a parent sleeps (i.e. suspended''suspends'') when a child is running (the exception is when the child process is running in the background)*UNIX / Linux processes are '''hierarchical'''. The process structure can have '''child processes''', '''great grandchild processes''', etc.