▁( sub ) ▁activities . ▁The ▁sub - process ▁contains ▁three ▁complex ▁activities ▁that ▁are ▁all ▁closed ▁activities ▁and ▁one ▁standard ▁activity . ▁ ▁Just ▁as ▁the ▁Control ▁sub - process ▁the ▁Plan ▁sub - process ▁is ▁mode led ▁using ▁the ▁meta - model ing ▁technique . ▁The ▁left ▁side ▁of ▁figure ▁ 2 . 2 . 1 ▁is ▁the ▁meta - data ▁model ▁of ▁the ▁Plan ▁sub - process . ▁ ▁The ▁Plan ▁rectangle ▁is ▁an ▁open ▁( complex ) ▁concept ▁which ▁has ▁an ▁aggreg ation ▁type ▁of ▁relationship ▁with ▁two ▁closed ▁( complex ) ▁concepts ▁and ▁one ▁standard ▁concept . ▁The ▁two ▁closed ▁concepts ▁are ▁not ▁expanded ▁in ▁this ▁particular ▁context . ▁ ▁The ▁following ▁picture ▁( figure ▁ 2 . 2 . 1 ) ▁is ▁the ▁process - data ▁diagram ▁of ▁the ▁Plan ▁sub - process . ▁This ▁picture ▁shows ▁the ▁integration ▁of ▁the ▁two ▁models . ▁The ▁d otted ▁ar rows ▁indicate ▁which ▁concepts ▁are ▁created ▁or ▁adjust ed ▁in ▁the ▁corresponding ▁activities ▁of ▁the ▁Plan ▁sub - process . ▁ ▁Figure ▁ 2 . 2 . 1 : ▁Process - data ▁model ▁Plan ▁sub - process ▁ ▁Im plementation ▁ ▁The ▁Im plementation ▁sub - process ▁makes ▁sure ▁that ▁all ▁measures , ▁as ▁specified ▁in ▁the ▁plans , ▁are ▁properly ▁implemented . ▁During ▁the ▁Im plementation ▁sub - process ▁no ▁measures ▁are ▁defined ▁nor ▁changed . ▁The ▁definition ▁or ▁change ▁of ▁measures ▁takes ▁place ▁in ▁the ▁Plan ▁sub - process ▁in ▁co operation ▁with ▁the ▁Change ▁Management ▁Process