Results not systematic

• Possible variation of results among experts
• Difficult to analyze effectiveness of results
• Hard to refine or improve process
• Long-term organizational interest in clarifying rules and systematizing the process

Data possibly incomplete or inconsistent

• Different sources of data possible
• Not all sources always used
• Sensors can malfunction
• Tests not always reported
• Occasional errors in test results

created April 30, 2003 last revised May 13, 2003

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