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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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Transforming FP&A Together: Human & AI Synergy
 
First Steps into AI in FP&A: Getting Started Without Getting Overwhelmed
 
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Creating Your Transformation Map with the FP&A Trends Maturity Model
 
Mastering Data in FP&A: Turning Analytics into Strategic Advantage
 
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Creating Your Transformation Map with the FP&A Trends Maturity Model
 
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FP&A Storytelling in a Data-Driven World
 
From Insight to Impact: FP&A Business Partnering in Action
 
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All events for the year

Future Meetings

The Face-to-Face Zurich FP&A Board: Debunking FP&A Myths: Agile Strategies for Forecasts and Scenarios
The Face-to-Face Zurich FP&A Board Transforming FP&A Together: Human & AI Synergy

November 4, 2025

The Digital Nordic & Benelux & UKI FP&A Circle: First Steps into AI in FP&A: Getting Started Without Getting Overwhelmed
The Digital EMEA FP&A Circle First Steps into AI in FP&A: Getting Started Without Getting Overwhelmed

November 5, 2025

The Face-to-Face Munich FP&A Board: Creating Your Transformation Map with the FP&A Trends Maturity Model
The Face-to-Face Munich FP&A Board Creating Your Transformation Map with the FP&A Trends Maturity Model

November 11, 2025

The FP&A Trends Webinar: Mastering Data in FP&A – Building Analytical Capabilities for Strategic Growth and Informed Decision-Making
The FP&A Trends Webinar Mastering Data in FP&A: Turning Analytics into Strategic Advantage

November 12, 2025

The Face-to-Face Copenhagen FP&A Board
The Face-to-Face Copenhagen FP&A Board Creating Your Transformation Map with the FP&A Trends Maturity Model

November 18, 2025

The Face-to-Face Riyadh FP&A Board: FP&A Storytelling in a Data-Driven World
The Face-to-Face Riyadh FP&A Board FP&A Storytelling in a Data-Driven World

November 24, 2025

The Face-to-Face Dubai FP&A Board: From Insight to Impact: FP&A Business Partnering in Action
The Face-to-Face Dubai FP&A Board From Insight to Impact: FP&A Business Partnering in Action

November 26, 2025

The FP&A Trends Webinar: FP&A 2026+: Top 5 Trends Through the AI Lens
The FP&A Trends Webinar Visionary Trends in FP&A: A Strategic Look Toward 2030

December 4, 2025

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