The purpose of this state report card is to provide the general public and policymakers with information they can use to assess and improve postsecondary education in each state. "Measuring Up 2006" is the fourth in a series of biennial report cards. The report card grades states in six overall performance categories: (1) Preparation: How adequately does the state prepare students for education and training beyond high school?; (2) Participation: Do state residents have sufficient opportunities to enroll in education and training beyond high school?; (3) Affordability: How affordable is higher education for students and their families?; (4) Completion: Do students make progress toward and complete their certificates or degrees in a timely manner?; (5) Benefits: What benefits does the state receive from having a highly educated population?; and (6) Learning: What is known about student learning as a result of education and training beyond high school? Findings for Idaho include: (1) Despite notable improvement, Idaho lags many other states in preparing students to succeed in college. This year Idaho receives a C in preparation; (2) Idaho has made no notable progress in enrolling students in higher education. This year Idaho receives a D+ in participation; (3) Idaho has made no notable progress in providing affordable higher education. This year Idaho receives a D in affordability; (4) Idaho has seen no notable improvement in the proportion of students earning a certificate or degree in a timely manner. This year Idaho receives a C+ in completion; (5) Despite improvement, Idaho continues to lag many other states in the benefits it receives from having a more highly educated population. This year Idaho earns a C- in benefits; and (6) Like most states, Idaho receives an "Incomplete" in Learning because insufficient data would not allow meaningful state-by-state comparisons. However, data are available this year to examine the readiness of college graduates--from two- and four-year institutions--for advanced practice. This report also includes international comparisons, additional information, questions and answers, and state grades. (Contains 3 figures.) [For "Measuring Up, 2006. The National Report Card on Higher Education," see ED493360.]