Four and five Star programs implement and maintain additional quality criteria and are awarded the highest Star levels. Nationally accredited programs and Head Start programs compliant with Head Start Program Performance Standards can meet four and five Star levels by meeting all Star criteria for their Star level listed in previous sections plus implementing additional professional development criteria detailed in this section. Unaccredited programs can attain four and five Star levels by meeting all Star criteria for their Star level listed in previous sections plus implementing additional professional development and program criteria detailed in this section.