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Thorsteinn Siglaugsson

thorsteinn_siglaugsson_new.jpg

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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Event Calendar

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Bridging Today and Tomorrow: FP&A's Strategic Adoption of Present and Future AI Capabilities
 
Inside the Crystal Ball: Five Transformative Trends in FP&A in 2026 and Beyond
 
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Generative AI in FP&A: From Hype to Real Impact
 
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The Digital North American FP&A Circle
The Digital North American FP&A Circle Generative AI in FP&A: From Hype to Real Impact

December 9, 2025

The FP&A Trends Webinar. FP&A Roles Reimagined for the AI Agentic Era
The FP&A Trends Webinar FP&A Roles Reimagined for the Agentic AI Era

January 21, 2026

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