Define discretion as it applies to federal bureaucracy. Why might Congress grant bureaucratic agencies broad discretion in the implementation of federal laws?

What will be an ideal response?

An ideal response will:
1, Define discretion as the ability of federal bureaucrats to make choices concerning the best way to implement congressional or presidential intentions.
2, Note that agencies typically exercise greater discretion when implementing laws that contain ambiguity.
3, Explain one or more reasons that Congress might grant agencies broad discretion, such as when creating policies involving scientific or technical issues, or when ambiguity aids passage of a bill or allows members of Congress to avoid blame for potentially unpopular policies.