Blade Runner Vs. Androids

There are many differences between Do Androids Dream of Electric Sheep? and Blade Runner. In the book, human emotion was discussed over and over again, while in the movie it was not emphasized.

However, when Ridley Scott adapted Dick’s source material he made some …changes. And changes always occur in this sort of thing for better or for worse.

 address ONE change between book and movie and assess the following: 1. Why the change? 2. What was the effect of the change 3. Was this trip really necessary?