▁embedded , ▁will ▁evol ve ▁over ▁a ▁length y ▁period ▁of ▁time . ▁ ▁Gener ally , ▁the ▁tim eline ▁mil est ones ▁are ▁critical ▁for ▁a ▁successful ▁understanding ▁of ▁the ▁evolution ▁tim eline . ▁ ▁SV - 9 ▁Systems / Services ▁Technology ▁Fore cast ▁ ▁Def ines ▁the ▁underlying ▁current ▁and ▁expected ▁supporting ▁techn ologies ▁that ▁have ▁been ▁target ed ▁using ▁standard ▁forec ast ing ▁methods . ▁Ex pected ▁supporting ▁techn ologies ▁are ▁those ▁that ▁can ▁be ▁reason ably ▁forec ast ▁given ▁the ▁current ▁state ▁of ▁technology ▁and ▁expected ▁improvements . ▁New ▁techn ologies ▁should ▁be ▁tied ▁to ▁specific ▁time ▁periods , ▁which ▁can ▁correlate ▁against ▁the ▁time ▁periods ▁used ▁in ▁SV - 8 ▁mil est ones . ▁ ▁SV - 1 0 a ▁Systems / Services ▁R ules ▁Model ▁ ▁Descri bes ▁the ▁rules ▁under ▁which ▁the ▁architecture ▁or ▁its ▁systems ▁behave ▁under ▁specified ▁conditions . ▁ ▁SV - 1 0 b ▁Systems / Services ▁State ▁Trans ition ▁Description ▁ ▁A ▁graph ical ▁method ▁of ▁describing ▁a ▁system ▁( or ▁system ▁function ) ▁response ▁to ▁various ▁events ▁by ▁changing ▁its ▁state . ▁The ▁diagram ▁basically ▁represents ▁the ▁sets ▁of ▁events ▁to ▁which ▁the ▁systems ▁in ▁the ▁architecture ▁will ▁respond ▁( by ▁taking ▁an ▁action ▁to ▁move ▁to ▁a ▁new ▁state ) ▁as ▁a ▁function ▁of ▁its ▁current ▁state . ▁Each ▁transition ▁spec ifies ▁an ▁event ▁and ▁an ▁action . ▁ ▁SV - 1 0 c ▁Systems / Services ▁Event - Trace ▁Description ▁ ▁Prov ides ▁a ▁time - ordered ▁exam ination