6. Causes and corrective actions

6.1 General rules

Let's summarize the rules to be applied to detect a problem and apply the solution (table 3 ):

• systematic approach ;

• Precise location and identification of the problem, answering the questions: what, how, when, where (temporary, local) ;

• on-site verification of parameters (avoid sending samples to the laboratory whenever possible);

• Based on the results, draw up a list of probable causes;

• laboratory testing to identify the cause(s);

• measure preparation and implementation ;

• ...