These are the appendixes for the report, "Demographic and Academic Characteristics Associated with College Readiness and Early College Success in the Republic of the Marshall Islands." This study examined academic preparation characteristics and the college readiness and early college success of students who graduated from Republic of the Marshall Islands public high schools and enrolled at the College of the Marshall Islands between 2015 and 2017. It also examined the relationships between student demographic and preparation characteristics and college readiness and early college success. Four appendixes are included in the document: (1) Marshall Islands education system; (2) Methods; (3) Supporting analysis; and (4) Sensitivity analyses. [For the full report, see ED611200. For the study brief, see ED611202. For the study snapshot, see ED611204.]