What is the difference between --- MODE and --- INTERACTIVE PHASE?

--- INTERACTIVE PHASE is set during input processes and indicates which data
entry phase is currently in force. It works with  --- MODE and, although they
work together, each has a specific use.

MODE is determined when the user selects an input process from a menu and
selects a mode option (ADD, CHG, DEL, or INQ). INTERACTIVE PHASE determines
what the user may do while in that mode. For example, if you are in ADD mode
entering data into a scrolling frame, you can move the cursor to a previously
added record and select the change item option. At this time you will still be
in add mode, but the interactive phase will change from data addition to data
modification.