▁or ▁classes ▁that ▁are ▁used ▁to ▁implement ▁the ▁standard ▁structure ▁of ▁an ▁application ▁for ▁a ▁specific ▁operating ▁system . ▁By ▁bund ling ▁a ▁large ▁amount ▁of ▁re usable ▁code ▁into ▁a ▁framework , ▁much ▁time ▁is ▁saved ▁for ▁the ▁developer , ▁since ▁he / she ▁is ▁saved ▁the ▁task ▁of ▁re writing ▁large ▁amounts ▁of ▁standard ▁code ▁for ▁each ▁new ▁application ▁that ▁is ▁developed . ▁ ▁Ident ify ▁persistent ▁objects / data ▁( if ▁applicable ): ▁Ident ify ▁objects ▁that ▁have ▁to ▁last ▁longer ▁than ▁a ▁single ▁runtime ▁of ▁the ▁application . ▁If ▁a ▁rel ational ▁database ▁is ▁used , ▁design ▁the ▁object ▁relation ▁mapping . ▁ ▁Ident ify ▁and ▁define ▁remote ▁objects ▁( if ▁applicable ). ▁ ▁Output ▁( del iver ables ) ▁of ▁object - orient ed ▁design ▁ ▁Se quence ▁diagram : ▁Ext end ▁the ▁system ▁sequence ▁diagram ▁to ▁add ▁specific ▁objects ▁that ▁handle ▁the ▁system ▁events . ▁A ▁sequence ▁diagram ▁shows , ▁as ▁parallel ▁vertical ▁lines , ▁different ▁processes ▁or ▁objects ▁that ▁live ▁simultaneously , ▁and , ▁as ▁horizontal ▁ar rows , ▁the ▁messages ▁ex changed ▁between ▁them , ▁in ▁the ▁order ▁in ▁which ▁they ▁occur . ▁▁ ▁Class ▁diagram : ▁A ▁class ▁diagram ▁is ▁a ▁type ▁of ▁static ▁structure ▁U ML ▁diagram ▁that ▁describes ▁the ▁structure ▁of ▁a ▁system ▁by ▁showing ▁the ▁system ' s ▁classes , ▁their ▁attributes , ▁and ▁the ▁relationships ▁between ▁the ▁classes . ▁The ▁messages ▁and ▁classes ▁identified ▁through ▁the ▁development ▁of ▁the ▁sequence ▁diag rams ▁can ▁serve ▁as ▁input ▁to ▁the ▁automatic ▁generation