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Estimer (prédire) sans concevoir n'est pas crédible.
Concevoir complètement sans information mène à l'erreur.
Croire en la crédibilité totale de l'estimation (prédiction)n'est pas logique.(relève de la superstition)
Affecter les ressources pour une durée de plus d'un mois est utopique.
Les chinois disent: Être incertain c'est être inconfortable, être certain c'est être ridicule.
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