1. A method for package fill determination comprising the steps of: i) obtaining a historical data set; ii) obtaining a sampling manufacturing period iii) obtaining a variance model; iv) obtaining an estimation technique, wherein steps (i), (ii), (iii) and (iv) may be conducted in any order; iii) determining a variance component set using said variance model, said estimation technique, and said historical data set; iv) determining a first target by the method comprising the steps of: a) obtaining a first constraint set; b) obtaining a first probability; c) obtaining a product data set, wherein sub steps (a), (b) and (c) may be conducted in any order; and d) calculating said first target utilizing said variance component set such that the probability of satisfying said first constraint set is at least as great as said first probability.