The Office of Shared Accountability (OSA) in Montgomery County Public Schools (MCPS) conducted a linking study to examine the relationship of the Measures of Academic Progress (MAP) assessment with the Common Core Consortia Partnership for Assessment of Readiness for College and Careers (PARCC) assessment in the 2014-2015 school year. This is the first study to address how existing assessments administered in MCPS can serve as indicators of college and career readiness as measured by PARCC. The study served two major purposes: (1) to predict college and career readiness on summative PARCC based on fall MAP; and (2) to compare spring MAP and summative PARCC scores. The study results can provide information on how to use MAP data to adjust instruction and to provide additional supports for students at risk of not attaining college and career readiness scores on PARCC. The results can also provide actionable knowledge to stakeholders that will help improve the MCPS accountability system. This study addressed the following research questions for Grades 3-8 in reading and mathematics: (1) How did fall/spring MAP RIT scores correlate to summative PARCC scale scores?; (2) What were thresholds on fall MAP RIT scores that were associated with 65% and 75% probability (likelihood) of meeting the college and career readiness benchmark on PARCC (performance level 4 or higher)? How accurately did fall MAP RIT scores predict college and career readiness on PARCC?; and (3) How did spring MAP RIT scores correspond to PARCC scale scores? Analyses by grade, content area, and student group were conducted when applicable. The results of the study have demonstrated strong predictive and concurrent validity evidence for MAP and the summative PARCC assessments for both reading and mathematics across grade levels, which supports the continuous use of MAP assessments in MCPS for predicting PARCC success. More specifically, the study results can provide information to guide instructional practices and to help improve student academic performance toward meeting the college and career readiness benchmark on PARCC. The following are appended: (1) Graphical Presentation of College and Career Readiness Prediction; (2) Prediction Accuracy for College and Career Readiness; and (3) Concordance Tables for Spring MAP and PARCC.