This general achievement trends profile includes information that the Center on Education Policy (CEP) and the Human Resources Research Organization (HumRRO) obtained from states from fall 2008 through April 2009. Included herein are: (1) Bullet points summarizing key findings about achievement trends in that state at three performance levels--basic and above, proficient and above, and advanced; (2) Background information about limitations of the state's test data and characteristics of the state's testing system, including major changes in its testing system; (3) Figures and tables with the percentages of students scoring at the proficient level and above for all years with comparable data since 1999 and for all grades tested under the No Child Left Behind Act; (4) Figures and tables with percentages of students performing at three achievement levels--basic, proficient, and advanced--for all years with comparable data and for grades 4, 8, and 10 (or adjacent grades, in the case of states that lack comparable trend data for these default grades); (5) Figures and tables with mean scale scores, standard deviations, and effect sizes for all years with comparable data and for the three grades analyzed in this study; and (6) Figures and tables with mean scale scores, standard deviations, and effect sizes for all years with comparable data and for the three grades analyzed in this study. Delaware made changes to its testing program in 2006. As a result, only three years of comparable test data (2006-2008) are available, the minimum span needed to identify a trend. In general, results were mixed at the proficient, basic, and advanced levels. Specific results include: (1) Between 2006 and 2008, the percentage of students performing at the basic level and above in reading decreased slightly at the middle and high school grades analyzed; in math, the percentage basic and above declined slightly at the elementary and high school levels, but rose at a moderate-to-large rate at the middle school level; (2) The percentage of students scoring at the proficient level and above decreased slightly in reading at the elementary grade analyzed, dropped at a moderate-to-large rate at the middle school level, and increased slightly at the high school level; in math, Delaware experienced slight declines in the percentage proficient at the elementary and high school grades analyzed but a moderate-to-large gain at the middle school grade analyzed; and (3) The percentage of students reaching the advanced level in reading increased slightly at the elementary and high school levels but decreased at a moderate-to-large rate at the middle school level; in math, the percentage of students reaching the advanced level went up at a moderate-to-large rate at the elementary and middle school levels. (Contains 6 figures and 6 tables.) [For "State Test Score Trends through 2007-08, Part I: Is the Emphasis on 'Proficiency' Shortchanging Higher- and Lower-Achieving Students?," see ED506121. For "State Test Score Trends through 2007-08. Part II: Is There a Plateau Effect in Test Scores?," see ED506122.]