1 Introduction
  1.1 Introduction to production control
  1.2 Introduction to conformity control
  1.3 EN 206-1
  1.4 General
2 Background
  2.1 Uncertainty
  2.2 Variability of test data
  2.3 Systematic changes in concrete quality
  2.4 Speed of response to changes in concrete quality
  2.5 Variability in standard deviation
3 The use of concrete families in production control
  3.1 The basic concept
  3.2 Principles applicable to all systems
  3.3 Selecting the family
  3.4 Satisfying the specifying
  3.5 Coping with specials
4 The use of concrete families in conformity control
  4.1 Procedure for conformity
  4.2 Assessment of relationships
  4.3 Derivation of the confirmation criterion
5 Discussion
6 Conclusions
7 References
Appendix A: Examples of the use of the concept of concrete families
  Example 1: Concrete family containing aggregates of different
             sizes and cem ii-v cement
  Example 2: Concrete family concept with product specification
             based on performance as applied in the Netherlands
  Example 3: Conformity control of a concrete family containing
             different amounts of fly ash
  Example 4: All concretes made with cem i cement and 30% fly ash
  Example 5: Concrete family containing data from a number of
             plants using the same materials
Appendix B: Example of the effect on the standard deviation
            when data are transposed and pooled