Aworks success in contributing to the common good is

"A worker's success in contributing to the common good is measured by how well she or he does the job."

In teamwork, all participants have a part to do, a job that will, when summed to the other's job, make the desired whole for the common good.  When a worker does his or her job well, he will be having success, even if the final whole won't be what was desired - he did his part, and, therefore, in what was dependent of himself, the common good could be achieved. 

Not true , they can fall or something