The Bureau of Labor Statistics Employment Projections are developed to provide lawmakers with estimates for the upcoming decade regarding the US labor force, economic growth, commodity demand, industry output, and occupational employment. The data is also provided to the public in a nicely-curated product: the Occupational Outlook Handbook.
The Bureau of Labor Statistics creates EP using data from a few other federal sources:
The majority of the occupational employment data is obtained from the CES statistics, with any gaps, especially for agricultural and private households, informed by CPS data.
The EP employment counts are our primary source for employment by occupation.
For each career, EP shares percentages of workers from each education level. These statistics originate with the American Community Survey (ACS) and are identical across some similar careers because the ACS collects career information for a more broad definition of individual careers.
The typical education required for each career is also reported with EP data, and does not simply take the highest percentage reported from the education attained.