Authentic assessments are naturalistic methods to obtain functional, contextual information relevant to learning in routine activities. Seven focus groups were conducted with 73 practicing Part C early interventionists to gather their reports on authentic assessments. Participants reported various ways of applying authentic assessment methods, with eligibility determination identified as the most difficult assessment decision point and progress monitoring as the easiest assessment decision point to use such strategies. Barriers and facilitators to using authentic assessments were described in the themes of administrative requirements, knowledge and experience, and family-professional partnerships. Implications for professional development systems and early intervention leadership are discussed.