modifiable; changeable; updateable
change of schedule; schedule change
change in a bus route; change in policy; policy change (reversal)
change of course; route change; direction change
model change (esp. mobile phone); model upgrade
lane change; changing lanes
design change; engineering change
change log; revision history
notification of change; alteration report; registration of modification
clausula rebus sic stantibus (legal principle that agreements become non-binding if there is a major, unforeseeable change of circumstances)