Part of the role of the TopCoder competition management system is to ensure the quality and timeliness of deliverables. In it's simplest form, it is tuned to get the optimal outcome taking into account both competitor/reviewer and customer needs.
On feature that exists in the competition management platform is the concept of late deliverables. The system will automatically adjust payments for specific tasks in the competition process based on the whether or not the timeline and quality requirements were met. This helps hold participants in a given contest accountable to the timeline and requirements of the role they are participating in. For more details about this feature please follow these links:
For competitors/reviewers: http://apps.topcoder.com/wiki/display/tc/Late+Deliverables+Tracking