NEW ORLEANS — A presidential commission’s conclusion on the largest offshore oil spill in history that decisions meant to save time and money created an unreasonable amount of risk won’t be the final word on the disaster.

But it already has the companies involved with the blown-out well and Deepwater Horizon rig pointing fingers at each other again.

In a 48-page excerpt of its final report obtained Wednesday by The Associated Press, the commission described systemic problems within the offshore oil and gas industry and government regulators who oversee it. It also said such a disaster could happen again without significant reforms.

The full report is due to the president Jan. 11. But key questions will remain, namely: Why didn’t a hulking piece of equipment that sat at the wellhead and was supposed to choke off the flow of oil in the event of a blowout do its job? Federal investigators analyzing the blowout preventer at a NASA facility in New Orleans aren’t expected to finish until February.

The oil spill commission said poor decisions led to technical problems that contributed to the April 20 accident that killed 11 people and led to more than 200 million gallons of oil spewing from BP’s well a mile beneath the Gulf of Mexico.

BP, Halliburton and Transocean, the three key companies involved with the well and the rig that exploded, each made individual decisions that increased risks of a blowout but saved significant time or money.

But ultimately, the disaster came down to a single failure, the panel says: management. When decisions were made, no one was considering the risk they were taking.