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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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Event Calendar

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Transforming FP&A Together: Human & AI Synergy
 
From What-If to What’s Next: Scenario Management for Modern FP&A
 
Dynamic Shift: Mastering Predictive Planning & Forecasting
 
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From Insight to Impact: FP&A Business Partnering in the Age of AI
 
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Creating Your Transformation Map with the FP&A Trends Maturity Model
 
From Forecast to Action: Building Predictive Power into FP&A
 
Moving from FP&A to Extended Planning and Analysis (xP&A)
 
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The FP&A Analytics Playbook
 
 
All events for the year

Future Meetings

Register The Digital North American FP&A Circle: Predictive Planning & Forecasting: Building Intelligence into Every Decision
The Digital North American FP&A Circle From Forecast to Action: Building Predictive Power into FP&A

October 22, 2025

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

October 23, 2025

The FP&A Trends Webinar: The FP&A Analytics Playbook
The FP&A Trends Webinar The FP&A Analytics Playbook

October 29, 2025

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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