370 Part 3 Implementing Quality CASE Case 13-1 The Neiman-Marcus Cookie One of t

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370 Part 3 Implementing Quality CASE Case 13-1 The Neiman-Marcus Cookie One of the fun urban legends to pop up on the Internet I sad "Tm sorry, but this is the only way I feel I can has been the Neiman-Marcus Cookie. This work is in ge even," and I will the public domain and you might have seen it before. We present the legend here and propose that you run a few copies... . I paid for it, now you can have it develop a Taguchi experiment based on this recipe. It is for free. written in the first person by an anonymous a So here it is, and please pass it to someone else or uthor The Neiman-Marcus Cookie (recipe may be halved) 5 cups blended oatmeal 2 cups brown sugar 2 cups sugar 2 cups butter 2 tsp, soda 1 8-oz. Hershey bar, grated 2 tsp. baking powder 2 tsp, vanilla 4 cups flour 24 oz. chocolate chips 1 tsp, salt 4 e My daughter and I had just finished a salad at Neiman-Marcus in Dallas and decided to have a small dessert. Because our family are such cookie lovers, we decided to try the "Neiman-Marcus Cookie." It was so excellent that I asked if they would give me the recipe, and the server said with a small frown, I'm afraid not." Well, I said, would you let me buy the recipe? With a cute smile she said, "Yes.I asked how much, and she responded, Tofifty" I said with approval, just add it to my tab. Thirty days later, I received my Visa statement from Neiman-Marcus, and it was $285. I looked again and I remembered I had only spent $9.95 for two sal ads and about $20 for a scarf. As I glanced at the bot tom of the statement, it said, "Cookie Recipe $250 Boy, was I upse I called Neiman's accounting department and told them the waitress said it was two-fifty," and I did not realize she meant $250 for a cookie recipe. ges 3 cups chopped nuts Measure oatmeal and blend in a blender to I asked them to take back the recipe and reduce fine my bill, and they said they were sorry, but because all powder. In a separate bowl, cream the butter and both the recipes were this expensive so that not just anyone sugars. Add eggs and vanilla, mix together with oat could duplicate any of the bakery recipes, . .the bil meal, flour, salt, baking powder, and baking soda. Aded would stand. chocolate chips, Hershey bar, and nuts. Roll into balls and place two inches apart on a cookie sheet. Bake for 10 minutes at 375 degrees. Makes 112 cookies. I waited, thinking of how I could get even or even try and get any of my money back I just said "Okay, you folks got my S250, and Using this recipe and these production proce- now I'm going to have $250 worth of fun." I told her dures, develop a Taguchi experiment to find the optimal that I was going to see to it that every cookie lover wil process for making chocolate chip cookies. Be careful have a $250 cookie recipe from Neiman-Marcus for in identifying control factors, noise factors, objectives, nothing. She replied "I wish you wouldn't do this." and design the whole experiment.

Explanation / Answer

We will prepare a simple Taguchi experiment to find the optimal process for making chocolate chip cookies.

CONTROL FACTORS: Variation in the quantities of each of the following ingredients:

NOISE FACTORS: These are factors which are uncontrollable such as the degree of variation in ingredients, moistness or heat/temperature.

OBJECTIVES: If the taste of the chocolate chip cookies is to be evaluated subjectively, then the objective shall be the more the better. If there is a specified amount of chocolate chips to be present in each cookie, then the objective shall be nominal is the best.

EXPERIMENT:

Variable I: Measure of blended oatmeal Levels: 4 cups; 5 cups

Variable II: Measure of sugar Levels: 1.5 cups; 2 cups

Variable III: Measure of soda Levels: 1.75 tsp; 2 tsp

ORTHOGONAL ARRAY:

Columns

For the first experiment, the levels are kept as first levels of each variable.

Hence, 8 iterations of the taguchi experiment will be run with settings as prescribed in the above mentioned array.

Experiment Number 1 2 3 1 1 1 1 2 1 1 2 3 1 2 1 4 1 2 2 5 2 1 1 6 2 1 2 7 2 2 1 8 2 2 2

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