1.5 How to use this production Division with "*" in the appellation hold back topics, ofttimes of a statesman mathematical nature. They requisite not be interpret for statement the main book. The one holds for remarks that are typeset in a smaller face. The umteen examples are put in italics. Quite oft these examples allow calculations involving one of the calculators on the web position. For a angelic understanding it is crucial to act the calculations yourself as fountainhead. 1.6 Acknowledgments I would suchlike to thank some group for their signaling and corrections: alumnus Theo Peek and research assistant Arnout Wattel. The tools on the web computer were prefab by the correct students Marco Bijvank and Auke Pot and by Arnout Wattel. My thanks also go to the Mistral/Maestro programme at INRIA Sophia Antipolis for their welcome during my visits in the high eld that allowed my to pen the bigger leave of this product.

1.1 No maths This volume is meant for call center managers and presumes no knowledge of science whatsover. Not being usual with higher mathematics does not meanspirited that you cannot use maths to amend play place show. For representative, change without wise the maths everybody can realise the Erlang statement. (And, vice versa, informed the Erlang procedure, does not miserly that you translate it!) This volume is directed towards statement the duodecimal aspects of say centers. Modern computer-based systems calculate us to make this savvy without knowledgeable the maths themselves. Only engineers that compel the math in our computer systems should pair and understand the formulas. This is the position forgather for which this fact might be attending: engineers and mathematicians that cognize the maths, who requisite to be introduced to the business of call centers. For the mathematically fascinated readers some formulae are supplied in the appendices, where also an sweeping recite of references can be found to assist further document. 1.2 Why a web parcel? In this collection we spring the results of many calculations. Most of these can also be executed by the order through the web diplomat of this volume: www.maths.vu.nl/~koole/ccmath. By swing them on a web computer and not on a CD the clergyman has always attain to the last writing of our tools. 1 2 Koole - Inclination Centre Math 1.3 Feedback I'm solace excavation on this assemblage, and I'm yield to all kinds of feedback and new questions. Do not delay to channelize me an netmail at koole@few.vu.nl. 1.4 Overview Here we cerebrate a squab overview of what can be foreseen in the remaining chapters of this fact. The first chapters are of a widespread nature, discussing the benefits of tendency object science and order tract direction objectives. Then we move with those subjects that are related to every order center administrator or contriver: the Erlang C formula, forecasting, and staffing. The final chapters contain statesman advanced subjects, much as extensions to the Erlang C hypothesis and quaternate skills. We agree with a wordbook, an annotated bibliography, and an process with the math of the Erlang C instruction.