Hi Vijay, I am sorry that i didn't make myself clear. I followed your link @ http://www.ros.org/wiki/actionlib_tutorials/Tutorials/Writing%20a%20Callback%20Based%20Simple%20Action%20Client I am trying to understand how to make use of this code to send goal that are flexible as in able to change destination goal on event driven (e.g. keypress). One example will be --> robot is moving from A to B, on keypress, robot will change destination to C immediately. It will not move all the way to B then C. Currently, i am running on Cturtle on ubuntu 10.04LST. The problem I encountered is that the compiler is unable to find the actionlib_tutorials/FibonacciAction.h: No such file or directory during the make process of the code stated at the above link. I already checkout / rosmake the actionlib_tutorials package and is currently resided in my ~ros/stacks folder. Best Regards, Ian_wk -- View this message in context: http://ros-users.122217.n3.nabble.com/actionlib-tutorials-tp1453837p1476695.html Sent from the ROS-Users mailing list archive at Nabble.com.