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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

The Challenge of FP&A: What Limits the Value of FP&A?
January 16, 2019
FP&A Tags:
Financial Planning and Analysis, What is FP&A

​The daily routine of FP&A professionals revolves around providing reports and analyses for senior and operational management, to manage core processes such as budgeting, forecasting, cost allocation and consolidation. And usually they are hard-pressed for time.

Read more
Why Not to Use Spreadsheet-Based Budgeting
December 11, 2018
FP&A Tags:
Financial Planning and Analysis, Planning and Budgeting, FP&A Technology

Spreadsheets are a great tool to build and maintain ad-hoc calculations, quickly draft a business plan and create good-looking reports. But when it comes to planning and budgeting in a complex business environment the flexibility of spreadsheets is often quick to become an obstacle instead of an asset in your planning process.

Read more
Implementing a Corporate Planning Solution — a Few Guidelines
November 13, 2018
FP&A Tags:
FP&A Technology, Planning and Budgeting

When preparing the implementation of a planning and forecasting system I am often asked if we can just take the existing spreadsheet solution and squeeze this into the new system. Invariably my answer is: Yes, we can do this, but we should not. Why?

Read more
Rolling Forecasts — Why and How?
November 1, 2018
FP&A Tags:
Rolling Forecast, Financial Planning and Analysis, Beyond Budgeting, Modelling and Forecasting

Increasingly, managers are now looking to change the corporate planning process and replace the traditional annual budget with rolling forecasts, 12, 13 or 15 months ahead. What is the reason for this development?

Read more

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Modern Financial Planning and Analysis (FP&A): Latest Trends and Developments
 
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Future Meetings

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

Webinar: FP&A Trends Survey 2025
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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