After a season where the 2015 Athletics set an Oakland record number of one-run (35) and two-run (53) losses, the worst bullpen ERA (4.63) in the American League, and tied for third-most blown saves (25), it's safe to say that the A's are on their way to a major bullpen overhaul. One example of a successful overhaul the A's might look to is the Houston Astros, though it's a pretty simple formula and not a guarantee for success: spend money and hope you picked the right relievers.
Learning from the Astros
The Astros ended their 2014 with the worst bullpen ERA in baseball (4.