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

Service systems 12/2
Session Links
  • Service system: a service facility containing servers, customer entry and exit facilities, and a waiting facility
  • Examples
    • Bank tellers/waiting line
    • Airline passenger check-in/waiting line
    • Cafeteria
    • Hospital emergency room
    • Supermarket checkouts
    • Airport runway
    • Highway toll booths
    • Elevators
    • Telephone system (PBX)
    • Gas pumps
    • Tennis courts at a health club

Service systems serve customers. You’re very familiar with some kinds of service systems, because as a consumer, you’re often a customer. You’re less familiar with other service systems, because many of them are invisible to the public. One example of an invisible service system is the “print server” you use to print documents at your office. A single printer serves many people, and its service software is constructed as a service system.

Another example is the Internet. It’s essentially a network of servers that answer requests from customers. Slowly.

Some systems aren’t organized as servers. One example is the electric power grid. We all plug into it, and the power generators serve all customers at once. In its current structure, we can’t ask some people to wait while we deliver electricity to others. Since this capability is missing, we have only two ways to deal with excess demand. The first is to shut off part of the grid, which we call a blackout. The second is a tactic we call a “brown-out,” which is executed reducing the voltage delivered to all or part of the grid.

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.