Spreadsheet Models for Managers

Getting Access to Spreadsheet Models for Managers

If Spreadsheet Models for Managersyou use Excel to model businesses, business processes, or business transactions, this course will change your life. You’ll learn how to create tools for yourself that will amaze even you. Unrestricted use of this material is available in two ways.

As a stand-alone Web site
It resides on your computer, and you can use it anywhere. No need for Internet access.
At this Web site
If you have access to the Internet whenever you want to view this material, you can purchase on-line access. Unlimited usage. I’m constantly making improvements and you’ll get them as soon as they’re available.

To Order On Line

Order "Spreadsheet Models for Managers, on-line edition, one month" by credit card, for USD 69.95 each, using our secure server, and receive download instructions by return email.
Order "Spreadsheet Models for Managers, on-line edition, three months" by credit card, for USD 199.00 each, using our secure server, and receive download instructions by return email.
Order "Spreadsheet Models for Managers, downloadable hyperbook edition" by credit card, for USD 199.00 each, using our secure server, and receive download instructions by return email.

To Order by Mail

Make your check payable to Chaco Canyon Consulting, for the amount indicated:
  • For the download: USD 199.00
  • For access online for three months: USD 199.00
  • For access online for one month: USD 69.95
And send it to:
Chaco Canyon Consulting
700 Huron Avenue, Suite 19C
Cambridge, MA 02138

To use the course software you’ll need some other applications, which you very probably already have. By placing your order, you’re confirming that you have the software you need, as described on this site.

Spreadsheet Models for Managers

Session 12
Service Systems
Summary of Pages

A service system is a system in which customers present themselves, are serviced, and depart. For example, an airline ticket counter is a service system. Service systems are very common in business, and knowing how to model a service system’s capacity is an important skill for a modeler.

As common as service systems might seem, they are actually even more common. For example, a telephone switch is a service system — and so is the printer and copier in that little room down the hall from your office. So modeling service systems is even more important than you might think at first.

In this session, we’ll study single-server systems, probably the simplest form of service system, but also the most common. We’ll give you the tools you need to model them with enough fidelity that your models will make useful predictions of their capability and capacity. This is just what you need to determine whether these systems fulfill — or over-fulfill — the needs of the businesses they serve.

Below is a summary of pages for Session 12.

  1. Review of Last Time
  2. Service systems
  3. Service system components
  4. Arrival characteristics
  5. Poisson distribution
  6. Departure characteristics
  7. Exponential distribution
  8. Service facility properties
  9. Modeling waiting lines
  10. Performance measures for single server systems
  11. Example
  12. The main points
  13. Reference readings
  14. Preview of Next Time

Links to other materials for Session 12.

Last Modified: Wednesday, 27-Apr-2016 04:15:26 EDT

The Power of Simplifying Assumptions

Modeling service systems in general is extraordinarily complex, but as we’ve seen, if we make reasonable approximations, we can gain powerful tools that are very easy to apply. In the case of service systems, we assumed that the system was at equilibrium or close to it. Analogously, we can make simplifying assumptions for many other complex questions. Examples are process control, resource scheduling, resource allocation, cost allocation, vehicle routing, and many more.