Maintenance of Certification for Radiation Oncology

Part 3: Assessment of Knowledge, Judgment, and Skills

Last verified on May 16, 2023
Part 3 requires passing an Online Longitudinal Assessment (OLA) performance evaluation or a Continuing Certification Exam for each maintained certificate every five years. Each maintained certificate has a certification evaluation date at the end of a five-year cycle. An OLA performance evaluation meeting or exceeding the standard in year five or a Continuing Certification Exam with a passing result in year four or five is required to continue maintenance and start the next five-year cycle.
If you need more information about the Continuing Certification Exam, please click here.

Overview of the OLA Process

Within OLA, diplomates are provided two question opportunities each week. Question opportunities are available for four weeks to allow maximum diplomate flexibility.
After opening a question, diplomates are allowed a limited amount of time to answer the question and they learn immediately whether they answered correctly. In addition, they receive a brief rationale for the correct answer, as well as a reference.
OLA is designed to have minimal impact on a diplomate’s workday and requires no time away from work or travel expense. The potential for retesting areas of weakness provides a further opportunity for diplomates’ self-assessment of their professional growth.
For more information, please see OLA FAQs.


OLA became available to all diagnostic radiology diplomates in early 2019. OLA for radiation oncology, medical physics and interventional radiology diplomates followed in early 2020.
To ensure your certificates remain valid, please continue meeting requirements for Parts 1, 2, and 4 of MOC.