Systems Development Lifecycle consists of four phases: Planning, Analysis, Design, and Implementation. In the SDLC, needs and expectations of information system users, i.e., information users, are mainly studied from the standpoint of IT at the analysis phase, but occasions and methods to feedback information users' needs and expectations from the standpoint of businesses to systems development are very restricted after the implementation phase. Information quality is defined as degree of fitness for use of information provided by information systems, and increasingly more researches have recently been devoted to it. This research discusses that measurement of information quality would constitute a feedback from information users to systems planning and development after the implementation phase, and introduce two topics useful to link the feedback to systems improvement.