Temporary work or temporary employment (also called gigs) refers to an employment situation where the working arrangement is limited to a certain period of time-based on the needs of the employing organization. Temporary employees are sometimes called "contractual", "seasonal", "interim", "casual staff", "outsourcing", and "freelance"; or the words may be shortened to "temps". In some instances, temporary, highly skilled professionals (particularly in the white-collar worker fields, such as human resources, research and development, engineering, and accounting) refer to themselves as consultants. Increasingly, executive-level positions (e.g., CEO, CIO, CFO, CMO, CSO) are also filled with interim executives or fractional executives.