▁software ▁is ▁put ▁into ▁production ▁and ▁runs ▁actual ▁business . ▁ ▁Main ten ance : ▁During ▁the ▁maintenance ▁stage ▁of ▁the ▁SD LC , ▁the ▁system ▁is ▁ass essed / evalu ated ▁to ▁ensure ▁it ▁does ▁not ▁become ▁ob sole te . ▁This ▁is ▁also ▁where ▁changes ▁are ▁made ▁to ▁initial ▁software . ▁ ▁E valu ation : ▁Some ▁companies ▁do ▁not ▁view ▁this ▁as ▁an ▁official ▁stage ▁of ▁the ▁SD LC , ▁while ▁others ▁consider ▁it ▁to ▁be ▁an ▁extension ▁of ▁the ▁maintenance ▁stage , ▁and ▁may ▁be ▁referred ▁to ▁in ▁some ▁circles ▁as ▁post - implementation ▁review . ▁This ▁is ▁where ▁the ▁system ▁that ▁was ▁developed , ▁as ▁well ▁as ▁the ▁entire ▁process , ▁is ▁evaluated . ▁Some ▁of ▁the ▁questions ▁that ▁need ▁to ▁be ▁answered ▁include ▁if ▁the ▁newly ▁implemented ▁system ▁meets ▁the ▁initial ▁business ▁requirements ▁and ▁object ives , ▁if ▁the ▁system ▁is ▁reliable ▁and ▁fault - tol er ant , ▁and ▁if ▁it ▁functions ▁according ▁to ▁the ▁approved ▁functional ▁requirements . ▁In ▁addition ▁to ▁evalu ating ▁the ▁software ▁that ▁was ▁released , ▁it ▁is ▁important ▁to ▁assess ▁the ▁effect iveness ▁of ▁the ▁development ▁process . ▁If ▁there ▁are ▁any ▁aspects ▁of ▁the ▁entire ▁process ▁( or ▁certain ▁stages ) ▁that ▁management ▁is ▁not ▁satisfied ▁with , ▁this ▁is ▁the ▁time ▁to ▁improve . ▁ ▁Dis pos al : ▁In ▁this ▁phase , ▁plans ▁are ▁developed ▁for ▁dis continu ing ▁the ▁use ▁of ▁system ▁information , ▁hardware , ▁and ▁software ▁and ▁making ▁the ▁transition ▁to ▁a ▁new ▁system .