Hoe begin je aan een carrière in OSINT?

  So, you have successfully completed your master’s degree in international security, international relations, history, intelligence studies or something similar, and you are very interested in pursuing a career in open source intelligence. Now what? This is a question I get a lot from postgraduate students. What practical tips can I give to actually prepare […]

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Internet Librarian-conferentie 2026

Internet Librarian 2026 conference is a virtual conference on technology, data and AI for libraries. This year’s edition aims to discuss how libraries are navigating the next evolution of AI, technology ecosystems and community connection to explore emerging AI and library technologies, learn actionable strategies, connect and network. The conference is planned for 26-29 October […]

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Open Source Intelligence Overview

Blush. The video is a TEDx talk I did for TEDxTwenteU in 2025 about open source intelligence that designed and managed since 1990 for the Dutch Defence Intelligence Service for about 23 years. May be have a look? Let me know your thoughts or questions. More on OSINT training: https://www.opensourceintelligence.biz […]

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CIA World Fact Book postponed

The World Factbook (WFB) was a popular reference tool for country studies. First launched in 1962 as a printed, classified reference manual, it described in numbers and short texts, the economies, military, geography, agriculture, industries, society, government, people, memberships, energy, health and much more of all the countries in the world, as well as areas […]

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The 3rd prompt principle

In the meantime, AI agents behaviour is remarkbly similar. I use ChatGPT, Perplexity, Copilot and Gemini hoping that the answers from one will augment the answers from the others.  Unfortunately, in my personal experience, that is not the case. Not only the answers are often identical, even the syntax grammar and writing style are identical […]

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The 2nd Prompt Principle

AI chatbots and LLM’s are an amazingly impressive development that will have a great impact on OSINT and intelligence analysis. Many of you use chatbots may be even on a daily basis for a variety of tasks and assignments, from simple ones to more complex things. And results can be surprising. That is, surprisingly good […]

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Intelligence analysis training programme

Proud to announce our first OSINT Intelligence Analysis training programme! Four days of hard work, starting with the fundamentals of OSINT followed by two full days of the best intelligence analysis techniques to make sense of a complex and confusing world. Conducted by Arno Reuser for the OSINT part, and Marc van Oudheusden for the […]

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On the difference between OSINT, OSINF, Information, Intelligence

…and how it all gets together Open Source Intelligence (OSINT) is a collaborative, integrated research/production METHODOLOGY to CREATE an actionable intelligence product (called OSINT report) resulting from analysis of a representative selection of open source information (OSINF) in order to meet some intelligence requirement that is used to take decisions and start some change. Open […]

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Marjon van Dijk,

Manager & gastvrouw
, Reuser’s Information Services