According to the BACB website bacb.com:
The Board Certified Assistant Behavior Analyst® (BCaBA®) is an undergraduate-level certification in behavior analysis. Professionals certified at the BCaBA level provide behavior analysis services under the supervision of Board Certified Behavior Analyst® (BCBA®).
Professionals certified at the BCaBA level may not provide behavior analysis services without the supervision of a Board Certified Behavior Analysts® (BCBA®). BCaBAs may supervise the work of Registered Behavior Technicians (RBTs®).
To maintain your BCaBA certification, you must complete ongoing continuing education, adhere to the BACB’s ethics requirements and self-reporting requirements, meet supervision standards for BCaBAs and submit a complete recertification application and associated fees every 2 years prior to your recertification date.
Initial BCaBA certification indicates that an individual has met entry-level standards for practice as a behavior analyst. The purpose of the BACB’s continuing education (CE) requirement is to ensure that BCaBA certificants engage in activities that will expand their behavior-analytic skills beyond the requirements for initial certification, and help them stay up-to-date on developments in the profession.