The research for this report was conducted in two phases. The first phase analyzed the change in national job quality using multiple datasets, going back as far as 1970. In addition, the level and change in job quality was estimated for one state (Arizona). Some inconsistencies in the measurement of job quality exist across datasets. Complete results of this analysis, with a strong focus on Arizona data, are available in the report "Job Quality in Arizona". The second phase analyzed data for all states but was limited to two datasets, one presenting industrial data, the other occupational data. Because of the limited availability of state data by occupation, the time period analyzed was restricted to the years 2000 and 2003. The level of job quality in 2003 and the change between 2000 and 2003 are presented. The findings of the second phase, initially reported in "Job Quality in Arizona Compared to All States", are included in the current report, excluding detail provided for Arizona in the original report. Additional national and regional analyses are included in the current report.

The best way to evaluate job quality would be to analyze a dataset that presents both occupational and industrial data, but the only dataset of this nature available by state comes from the decennial census. It is severely limited by small sample size, the latest data are for 1999, and the 1999 data are not consistent with the 1989 data. Thus, the initial work by the Seidman Institute on job quality ("Job Quality in Arizona", March 2005, presented data on Arizona job quality from several sources of either industrial or occupational data. "Job Quality in Arizona Compared to All States" is an extension of the March 2005 report. Arizona’s job quality in the latest year and its change over time is compared to the national average and is ranked among the 51 “states” (including the District of Columbia).