Check out their page http://www.gao.gov
You can find a list of some of their available material at
Special Publications: Evaluation Research and Methodology
http://www.gao.gov/special.pubs/erm.html
These are all old, but still very good.
- Designing Evaluations. PEMD-10.1.4. May 1991. Guidance. 78
pp. http://www.gao.gov/products/PEMD-10.1.4
or pdf version here http://archive.gao.gov/t2pbat7/144040.pdf
and here http://www.gao.gov/special.pubs/pe1014.pdf
- Case Study Evaluations PEMD-10.1.9, November 1990 summary
here http://www.gao.gov/products/PEMD-10.1.9
and full report is here http://www.gao.gov/special.pubs/pe1019.pdf
- The Evaluation Synthesis PEMD-10.1.2, March 1992 summary
here http://www.gao.gov/products/PEMD-10.1.2
full report here http://www.gao.gov/special.pubs/pe1012.pdf
- Performance Measurement and Evaluation: Definitions and
Relationships. GAO-05-739SP, May 2005. http://www.gao.gov/new.items/d05739sp.pdf
- Quantitative Data Analysis: An Introduction. PEMD-10.1.11. June
1992.
Guidance. 110 pp summary here http://www.gao.gov/products/PEMD-10.1.11
full report here http://www.gao.gov/special.pubs/pe10111.pdf
- Using Structured Interviewing Techniques. PEMD-10.1.5. July 1991.
Guidance. 92 pp. http://www.gao.gov/special.pubs/pe1015.pdf
abstract here http://www.gao.gov/products/PEMD-10.1.4
A couple of other books at the GAO website not
listed there are these.
- Developing and Using Questionnaires PEMD-10.1.7 October 1993 238
pp. summary here http://www.gao.gov/products/PEMD-10.1.7
full report here http://archive.gao.gov/t2pbat4/150366.pdf
- Using Statistical Sampling, PEMD-10.1.6 summary here http://www.gao.gov/products/PEMD-10.1.6
full report here http://archive.gao.gov/t2pbat6/146859.pdf
- Content Analysis: A Methodology for Structuring and Analyzing
Written
Material. PEMD-10.3.1. September 1, 1996. Guidance. 57 pp. http://archive.gao.gov/f0102/157490.pdf
abstract here http://www.gao.gov/products/PEMD-10.3.1