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David Tulett

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Version 3.8.8.4 of Decision Modelling

Posted By David Tulett 06-25-2026 17:22
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I have made Version 3.8.8.4 of Decision Modelling. Until now, I provided a URL from which a free download could be obtained, but the server is currently having technical difficulties, therefore I have attached the pdf file to this message. The changes since Version 3.8.8.3 are minor. The latest version ...

Version 3.8.8.4 of Decision Modelling Attachments

Posted By David Tulett 06-25-2026 17:21
Found In Library: Open Forum

RE: Choosing better problems to solve - my passion project

Posted By David Tulett 02-10-2026 08:51
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Zohar, Congratulations on your website! When I taught how to solve optimization models which have only two variables, I replaced the terms "isoprofit line" and "isocost line" with "isovalue line". I did this to emphasize that OR models need not be about money. We might instead want to maximize access ...

Version 3.8.8.2 of Decision Modelling

Posted By David Tulett 01-29-2026 17:17
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Version 3.8.8.2 of Decision Modelling is available for free pdf download from: https://linney.mun.ca/pages/view.php?ref=36808. The biggest change since Version 3.8.8.1 is a new Appendix A.2 (the old A.2 is now A.3) which describes optimization using the open-source LibreOffice Calc. There have also been ...

Version 3.8.8 of Decision Modelling

Posted By David Tulett 11-24-2025 12:45
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Version 3.8.8 of Decision Modelling is available for free pdf download from: https://linney.mun.ca/pages/view.php?ref=36808. The most important change since Version 3.8.7 is the addition of a new Section 2.8, which describes the Excel Solver App. There are no changes to the end-of-chapter questions. ...

RE: Let's Take a Break! What Do You Enjoy Outside of OR and Analytics?

Posted By David Tulett 11-14-2025 14:12
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Thanks for asking that question! I am the editor of a directory of churches and other places of worship in or near St. John's, NL, Canada. It can be downloaded from https://queenscollegenl.ca/links/. I also sing bass in the choir of the Anglican Cathedral (entry 2.1 in the directory). David Tulett ...

Changes to the Solver parameters box in Excel Attachments

Posted By David Tulett 11-02-2025 19:18
Found In Library: Open Forum

Changes to the Solver parameters box in Excel

Posted By David Tulett 11-02-2025 19:18
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This message is intended for those who encourage their students to solve LP problems using the Solver in Excel. I added-in the Solver in Excel (part of the latest version of Microsoft 365) yesterday, and found that the Solver parameters box had completely changed. I presume that this change took place ...

Version 3.8.7 of Decision Modelling

Posted By David Tulett 08-18-2025 16:19
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Version 3.8.7 of Decision Modelling is available for free pdf download from: https://linney.mun.ca/pages/view.php?ref=36808. Changes have been made in several places since the last version, but in particular, Appendix A on Software for Optimization was substantially reorganized. This book covers the ...

Version 3.8.5 of Decision Modeling

Posted By David Tulett 07-16-2025 00:15
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Version 3.8.5 of Decision Modeling is available for free pdf download from: https://linney.mun.ca/pages/view.php?ref=36808. Compared with the previous version, I fixed a couple of mistakes, and I found several places where the wording or structure could be improved. In one place, the original text spoke ...

RE: Version 3.8.0 of Decision Modeling

Posted By David Tulett 07-03-2025 14:57
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Sorry, I must have inadvertently re-posted a message from a month ago. The Decision Modeling book is currently in Version 3.8.3, and can be downloaded for free from https://linney.mun.ca/pages/view.php?ref=36808. Happy July 4th to everyone in the USA! ------------------------------ David Tulett Retired ...

RE: Version 3.8.0 of Decision Modeling

Posted By David Tulett 07-02-2025 13:00
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--- David M. Tulett, PhD Retired from the Faculty of Business Administration Memorial University St. John's, NL, Canada, A1B 3X5 dtulett@mun.ca “... read, mark, learn, and inwardly digest ...” We acknowledge that the lands on which Memorial University’s campuses are situated are in the traditional ...

RE: Seeking Guidance on PhD Applications in Operations Research

Posted By David Tulett 06-19-2025 12:47
Found In Egroup: INFORMS Open Forum \ view thread
Cornelius, Trump has created a hostile environment for foreign students wishing to study in the USA. Try applying to a PhD program in another country, such as the United Kingdom or Canada. ------------------------------ David Tulett Retired Memorial University of Newfoundland St. John's Canada dtulett@mun.ca ...

Version 3.8.0 of Decision Modeling

Posted By David Tulett 05-07-2025 08:36
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Version 3.8.0 of Decision Modeling is available for free pdf download from: https://linney.mun.ca/pages/view.php?ref=36808. Some end-of-chapter problems have been added to Version 3.7.0. Two of these problems are quite challenging, and they have been identified as such. This book covers the modeling ...

Version 3.7.0 of Decision Modeling

Posted By David Tulett 02-17-2025 15:03
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Version 3.7.0 of Decision Modeling is available for free pdf download from: https://linney.mun.ca/pages/view.php?ref=36808. Here are the changes from Version 3.6.2: (a) In Chapter 1, two images of the Home Tab in Excel are now shown in the latest version (this was last updated in 2023). (b) In Chapter ...

A 25% tariff on a free book costs nothing!

Posted By David Tulett 02-01-2025 18:21
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U.S. President Trump today imposed a 25% tariff on most things imported to the USA from Canada. However, my book on Decision Modeling has been, and will continue to be, a free pdf download, hence $0.00 + 25%($0.00) = $0.00. Version 3.6.2 is available for free pdf download from: https://linney.mun.ca ...

Business case added to the Decision Modeling textbook

Posted By David Tulett 11-25-2024 12:55
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I retired from Memorial University on August 31, 2024. In September, while cleaning out the 39 years of accumulated files in my office, I discovered a case that I had written in 1991, called Bonavista Kippers. Its solution involves the use of linear optimization to optimize a production plan for products ...

Version 3.5.0 of Decision Modeling

Posted By David Tulett 07-17-2024 13:32
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Since Version 3.4.0 of Decision Modeling, some new material has been added in Section 3.5.6 (pages 203-206), and a new problem for student completion which is related to this new material appears in section 3.7.1 as # 18 on page 216. A few minor changes appear elsewhere. Version 3.5.0 is available for ...

RE: Teaching Intro to management Science

Posted By David Tulett 04-30-2024 15:16
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Professor Hu, Thanks for your message. An intro survey course in this area in business schools is often done by students (specially majors in Human Resources, Marketing, and so on) who have little interest in programming in a computer language, so that's why I searched for something else. Everyone ...

RE: Teaching Intro to management Science

Posted By David Tulett 04-30-2024 07:54
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In the textbook that I have written called Decision Modeling (which can be downloaded for free from https://linney.mun.ca/pages/view.php?ref=36808) , I use both Excel and LINGO. LINGO has two ways of being used: scalar mode, and sets mode. Scalar mode is much easier to use than sets mode, and in my opinion ...