As most clients only appreciate things when they see them; a better enviroment to mock up applications which look and feel like the real thing but take less tim

As most clients only appreciate things when they see them; a better enviroment to mock up applications which look and feel like the real thing but take less time than actually implementing the real thing. I used many tools meant for that but usually the endclient (internal or external) says ‘yes thats great’ or ‘come back when its done’, which are basically the same remark in reality. In the first case when you deliver, they feed back things 80% of which could have been caught when you showed the mockup/clickthrough but they really thought at that time ‘yeah looks ok, but come back when its done’. Besides just spending far too much time on actually doing a chunk of the actual work (which might not yet be commissioned for), I have not found effective ways of fixing this issue.