Most of my CAL Brethren will want to tar and feather me for saying this but PBS is not bad, we happened to negotiate a weak position reference PBS.

PBS is a computer program that allows pilots to make/build specific lines of flying that accommodate the individual pilot and the company easier than hard lines can. At the commencement of each bidding period, a pilot specifically states, from thousands of possibilities, the exact schedule said pilot wants. In theory, the most senior pilot will acquire the exact schedule he wants every month and the subsequent pilot will have as close to what he wants without impacting the more senior pilot's bid........herego...scheduling heaven. The unmentioned problem with PBS at CAL is that the company also bids every month for what it wants from the pilot group. Our pilot group did not negotiate for any input into what the company's monthly bid could encompass, or as CAL PBS states "Overall System Constraints", therefore leaving us with an opaque system in which a pilot's bid can be denied due to "Overall System Constrains" that the pilot group is unaware of and that trump the most senior pilot's bid request. In summary, since the CAL pilot group, self included, has no input into the "overall system constraints" and said "constraints" trump bidding seniority requests, a CAL pilot's schedule will reflect whatever constraint's the company inputs into the PBS system every month. Hence, giving the company a blank check to do whatever it wants to the schedule and the pilot group every month.
On another note, the guys who sold this system to the CAL pilot group were generously rewarded by the company in the same manner that the latest contract negotiating committee were rewarded for selling our POS contract to the pilot group were. Fellas, it's time for a shake-up!