Innovation challenges solicit ideas and solutions to address development challenges. Innovation challenges: (a) often include stakeholders who are not necessarily affected by the development challenge, but well placed to develop solutions, including private sector actors; (b) typically limit themselves to the generation or testing of ideas, but not their implementation; (c) can be awarded directly by the head of office for grants up to $40,000 without further review. See the policy on innovation challenges. 29. Innovation challenges can be done in projects directly implemented by UNDP or when UNDP provides support services to national implementation (COS services). Low-value grants can be used in parallel to other engagement types with responsible parties or as part of a dedicated grant project.