Activity versus productivity

“The next day, Hem and Haw returned with tools. Hem held the chisel, while Haw banged on the hammer until they made a hole in the wall of Cheese Station C. They peered inside but found no Cheese.
“They were disappointed but believed they could solve the problem. So they started earlier, stayed longer, and worked harder. But after a while, all they had was a large hole in the wall.
Haw was beginning to realize the difference between activity and productivity.”

Page 42 of Who Moved My Cheese? by Dr Spencer Johnson