Why Do We Need Standards?
- Standards are prepared by experts on the subject and they represent a summary of the current state of knowledge on the best practices to use.
- If everyone uses the same, best method then results between laboratories will have better reproducibility (i.e., agreement between laboratories)
- National and international standards are continuously revised and kept up-to-date with changes in technology.
Types of Standards
- Company standards relate best to the local needs, but the methods may be poorly developed and defined
- National standards developed by industry/academic experts in the particular field but the practices and quality of the standards vary from country to country
- International standards –these are written, and balloted in a number of countries with leading technology and should represent the best ideas on a given test method (ISO)
- ISO standards tend to be short in length and contain only the basic information required
- ASTM test method standards give more background details and have precision and bias data based on interlaboratory test programs (“round robins”)