The phrase "blended workforce" refers to

the fact that contract employees now work side by side with government employees in most areas of government activity.

a recruitment and hiring policy implemented by the federal government in order to increase racial and ethnic diversity within the federal workforce.

the federal government's policy of replacing $10$ percent of all employees with automated technology by $2020.$ the fact that most federal employees now have appointments in two or more separate cabinet$-$level departments.