President Trump promoted his own version of reality in the Oval Office after firing the head of the agency that collects employment statistics last week.

On Friday, the Bureau of Labor Statistics released a jobs report that upended the narrative pundits, journalists, government officials, and the White House had been repeating for months: The economy is doing just fine.

How exactly does the BLS assemble the critical jobs report? And what is the commissioner’s role? Here’s what we know.