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Thorsteinn Siglaugsson

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Thorsteinn has for many years provided consulting and executive training in The Logical Thinking Process methodology for business analysis, improvement and strategy formulation. He now runs an online practitioner training course in the Logical Thinking Process, provided by Marris Consulting in Paris. Thorsteinn is the author of "From Symptoms to Causes – Applying the Logical Thinking Process to an Everyday Problem" and maintains a blog on logical analysis and critical thinking, "The Edge of Reason" (https://thorsteinnsiglaugsson.substack.com).

 Thorsteinn has been involved in FP&A for over 20 years. His experience as a consultant, trainer and manager covers business intelligence, planning and budgeting and software development. He has been active in training and development in the field, participated in the Beyond Budgeting Roundtable and has written extensively on planning, budgeting and decision-making. He is a member of the subcommittee on strategy and performance evaluation of the Icelandic Management Society, and chairman from 2020-2023.

Thorsteinn holds a BA degree in philosophy, an MBA from INSEAD and is a certified expert in The Logical Thinking Process.

Author's Articles

Should We Abandon Budgeting or Can We Improve It?
September 27, 2018
FP&A Tags:
Planning and Budgeting, Beyond Budgeting

Traditional budgeting has for a long time been criticized for encouraging counterproductive behaviour, hindering growth and wasting time on useless exercises. In recent years, the Beyond Budgeting methodology has gained ground as an alternative.

Read more
The Logical Thinking Process – A Game Changer
September 5, 2018
FP&A Tags:
Financial Planning and Analysis

The Logical Thinking Process was originally developed by Dr. Eliyahu M. Goldratt, author of bestselling business novel „The Goal“ and pioneer of modern production and process management, as a method to improve decision making in the corporate environment. The purpose of the Logical Thinking Process is to help people make better use of logic and the methods of the natural sciences to analyze complicated situations and formulate strategy.

Read more

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The Face-to-Face Singapore FP&A Board: Modern Financial Planning and Analysis (FP&A): Latest Trends and Developments
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July 8, 2025

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The FP&A Trends Webinar 2025 FP&A Trends Survey: Benchmarks, Priorities, and Best Practices

July 9, 2025

Face-to-Face Oslo FP&A Board
The Launch of the Oslo FP&A Board Modern Financial Planning and Analysis (FP&A): Latest Trends and Developments

September 16, 2025

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