Working with Legos to build the robot wasn't that difficult.This is because the instruction gives you step by step of what to do. So it was very easy in building the robot. There was some difficulty in the programing in the robot this is because the different NXT programmers was difficult to understand. The door alarm was the first robot we built and it was our first experience in using the robot. This helped us understand how the robot works and functions. The structure of the door alarm was very simple and the programing was also very easy. Once it was finally done we were proud and excited see the door alarm work. We continued with the steps which lead us to build the 5min robot, and it was just a car. Now the 5min robot was a little bit more complicated than the door alarm. This is because there was more steps to it and there were pieces that we did not have, which slowed us down. Because there were pieces missing we had to improv