Both experts hired to weigh in on OPA practices suggested that the city could improve property valuations by implementing a Computer Assisted Mass Appraisal (CAMA) program. Officials first contracted with a company to launch such a system in 2006; the city has since spent millions of dollars on various contracts and years of delay. The CAMA system is currently expected to launch in early 2020, OPA said in its response to the audit issued Tuesday, and will be used for 2021 assessments.