Part-time

The Federal Employees Part-Time Career Employment Act of 1978 established a continuing program for promoting and expanding part-time employment. It defined part-time career employment as regularly scheduled work from 16 to 32 hours per week for employees who became part-time on or after April 8, 1979. Permanent part-time employees are generally eligible for retirement, life insurance and health benefits. 

Seasonal 

Seasonal employment is defined as annually recurring periods of work of at least 6 months, but less than 12 months, during a calendar year. Recurring work that lasts less than 6 months is considered as temporary employment. The agency determines the length of the season, subject to the condition that it be clearly tied to the nature of the work.

Seasonal employees are permanent employees who are placed in nonduty/nonpay status and recalled to duty in accordance with preestablished conditions of employment. Seasonal employees received the full range of benefits, consistent with the career-conditional or career appointment. 

Intermittent

Intermittent employment is defined as employment without a regularly scheduled tour of duty. It is appropriate when the nature of the work is sporadic and unpredictable so that a tour of duty cannot be regularly scheduled in advance. Intermittent employees do not earn leave and are ineligible for life insurance and health benefits.