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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

Thorsteinn-Siglaugsson-AI-for-Decision-Making-Main
Using AI to Improve Our Decisions - A Virtuous Cycle
June 29, 2023
FP&A Tags:
AI/ML FP&A, FP&A Technology

In this article, the author explains why FP&A should take advantage of the possibilities offered by large language models like ChatGPT and how such tools can help us improve the decision-making process.

Read more
Thorsteinn-Siglaugsson-Why-Do-We-Make-Wrong-Decisions
Why We Make Wrong Decisions and How We Can Avoid Them - An Icelandair Case Study
April 11, 2023
FP&A Tags:
FP&A Case Studies

FP&A expert has to help management make the right decisions. The expert must be able to perform a rigorous logical analysis of the consequences of the decision. This is why an FP&A specialist trained and experienced in visual cause-effect analysis can stand out from the crowd.

Read more
From Symptoms to Cause: How to Identify Faulty KPIs
January 3, 2020
FP&A Tags:
Financial Planning and Analysis, FP&A KPI

Setting targets and defining KPIs is one of the key tasks of FP&A professionals. Defining KPIs is tricky. When properly done they can really drive performance, but sometimes it is the other way around. We see this in the following practical example of the application of the Logical Thinking Process methodology for problem solving. 

 

 
Read more
The Challenge of FP&A: The Core Conflict
January 30, 2019
FP&A Tags:
Financial Planning and Analysis

In the first part of this discussion we identified the root cause that prevents FP&A to deliver its full value. In fact we have identified a core conflict of FP&A. This conflict can be described in different ways. 

Read more

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Event Calendar

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Transforming FP&A Together: Human & AI Synergy
 
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Moving from FP&A to Extended Planning and Analysis (xP&A)
 
Five Critical Roles for Building a World-Class FP&A Team
 
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FP&A Business Partnering and AI: A New Era
 
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Future Meetings

The Face-to-Face Amsterdam FP&A Board
The Face-to-Face Amsterdam FP&A Board Transforming FP&A Together: Human & AI Synergy

May 15, 2025

The Face-to-Face Milan FP&A Board
The Face-to-Face Milan FP&A Board Moving from FP&A to Extended Planning and Analysis (xP&A)

May 20, 2025

The Face-to-Face Frankfurt FP&A Board
The Face-to-Face Frankfurt FP&A Board Five Critical Roles for Building a World-Class FP&A Team

May 22, 2025

BPAI
The FP&A Trends Webinar FP&A Business Partnering and AI: A New Era

May 28, 2025

The Face-to-Face London FP&A Board: Data Management & Analytics: Unlocking FP&A Value
The Face-to-Face London FP&A Board Mastering Data in FP&A: Smarter Analytics, Better Decisions

June 5, 2025

FP&A Trends Webinar The Evolving Role of FP&A: From Number Cruncher to Strategic Advisor
The FP&A Trends Webinar Making FP&A Teams Fit for the Future

June 11, 2025

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

June 17, 2025

The Face-to-Face Sydney FP&A Board
The Face-to-Face Sydney FP&A Board Modern Financial Planning and Analysis (FP&A): Latest Trends and Developments

June 26, 2025

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

July 8, 2025

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