▁input ▁artifact s ▁for ▁object - orient ed : ▁▁ ▁Con cept ual ▁model : ▁Con cept ual ▁model ▁is ▁the ▁result ▁of ▁object - orient ed ▁analysis , ▁it ▁capt ures ▁concepts ▁in ▁the ▁problem ▁domain . ▁The ▁concept ual ▁model ▁is ▁explicitly ▁chosen ▁to ▁be ▁independent ▁of ▁implementation ▁details , ▁such ▁as ▁conc urrency ▁or ▁data ▁storage . ▁ ▁Use ▁case : ▁Use ▁case ▁is ▁a ▁description ▁of ▁sequences ▁of ▁events ▁that , ▁taken ▁together , ▁lead ▁to ▁a ▁system ▁doing ▁something ▁useful . ▁Each ▁use ▁case ▁provides ▁one ▁or ▁more ▁scenarios ▁that ▁convey ▁how ▁the ▁system ▁should ▁interact ▁with ▁the ▁users ▁called ▁actors ▁to ▁achieve ▁a ▁specific ▁business ▁goal ▁or ▁function . ▁Use ▁case ▁actors ▁may ▁be ▁end ▁users ▁or ▁other ▁systems . ▁In ▁many ▁circumstances ▁use ▁cases ▁are ▁further ▁elabor ated ▁into ▁use ▁case ▁diag rams . ▁Use ▁case ▁diag rams ▁are ▁used ▁to ▁identify ▁the ▁actor ▁( users ▁or ▁other ▁systems ) ▁and ▁the ▁processes ▁they ▁perform . ▁ ▁System ▁Se quence ▁Di agram : ▁System ▁Se quence ▁diagram ▁( SS D ) ▁is ▁a ▁picture ▁that ▁shows , ▁for ▁a ▁particular ▁scenario ▁of ▁a ▁use ▁case , ▁the ▁events ▁that ▁external ▁actors ▁generate , ▁their ▁order , ▁and ▁possible ▁inter - system ▁events . ▁ ▁User ▁interface ▁document ations ▁( if ▁applicable ): ▁Document ▁that ▁shows ▁and ▁describes ▁the ▁look ▁and ▁feel ▁of ▁the ▁end ▁product ' s ▁user ▁interface . ▁It ▁is ▁not ▁mand atory ▁to ▁have ▁this , ▁but ▁it ▁helps ▁to ▁visual ize ▁the