Arizona's English Language Development Model (ELD Model) is intended to increase and accelerate the learning of English by English Language Learners (ELLs), so that the students can then be ready, when they know the English language, to learn the other academic subjects together with their English speaking peers. This model is part of a response to comply with the Flores Consent Order to improve services for ELLs in Arizona public schools. Whether or not it actually has improved instruction for ELLs has been the subject of much debate and, in 2012, after four years of the requirement to use Arizona's ELD Model, the ELL students who were identified as reclassified for the six districts in the study did not pass the Arizona's Instrument to Measure Standards (AIMS) test. The model's requirement to separate students who are not proficient from students who are proficient, the assessment used for identification of ELLs, and the Structured English Immersion four hours of English only instruction are at the nexus of the controversy, as the courts accepted the separate four hour SEI portion of the model for instruction as sufficient to meet the needs of ELLs in Arizona (Garcia, 2011, Martinez, 2012, Lawton, 2012, Lillie, 2012). This study examines student achievement in Reading and Math as measured by AIMS standards-based tests in six urban K-8 public school districts between 2007-2012. This period was selected to cover two years before and four years after the ELD model was required. Although the numbers of ELLs have decreased for the State and for the six urban elementary districts since the advent of the Arizona ELD Model, the reclassified ELL subgroup in the studied districts did not pass the AIMS for all the years in the study. Based on those results, this study concludes with the following recommendations. First, to study the coming changes in the language assessments and their impact on ELLs' student achievement in broad and comprehensive ways; second, to implement a model change allowing school districts to support their ELLs in their first language; and, finally, to establish programs that will allow ELLs full access to study with their English speaking peers.