Incorporating EC Data into Your State’s Longitudinal Data System: Why Does it Matter to Part C and 619? January 1, 2013 by Elaine Mulligan This 2013 presentation provides basic information about the differences between the ECIDS and the SLDS and discusses the unique challenges and benefits of ECIDS to Part C and B. Presented at 2013 Improving Data, Improving Outcomes Conference Incorporating EC Data into Your State’s Longitudinal Data System: Why Does it Matter to Part C and 619?