The very reason for presenting this short paper at the ''world congress on
 genetics applied to livestock production' is the existence of a session on 'effecting improvement in pigs and poultry'.
Apart from the day to day routine of effecting improvement, time should be taken to evaluate past and present activities. The turn of a decade is a suitable moment. The question to be answered is: did 10 years of activities bring about (genetic) improvement in pig production and if so, was the return on investment as large as possible, given the available tools. If not what are the major inefficiencies.
To quantify some of the inefficiencies of a continuous commercial improvement program, some results will be given. These results will serve as a start for further discussion.

Egbert F Knol, B. AJ Molenaar

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XV. Beef cattle, sheep and pig genetics and breeding, fibre, fur and meat quality., , 446–449, 1990
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