All courses were developed by Arno Reuser, the OSINT authority of the Netherlands and abroad, with nearly 30 years of experience within the Dutch military intelligence services (MIVD)

Teachers with operational experience within intelligence services

Suitable for students with different experience and skill levels (beginners to experts)

The courses are energetic, challenging and aimed at acquiring highly applicable skills

OSINT Course

Open Source Intelligence techniques by Arno Reuser

Online open source research often yields disappointing results due to incorrect search behavior. However, applying the right research methods provides a wealth of valuable information. In collaboration with Reuser's Information Services, Triangular Group Academy now offers high-quality OSINT courses, taught and developed by Arno Reuser himself.

During our OSINT course cyber-security, planning (so-called 'intell collection plans'), hands-on tools, the use of various search engines and operational tips & tricks are discussed on the basis of case histories. The students learn a methodical, effective and goal-oriented online research method. The training focuses on the OSINT research method developed by Arno Reuser, which focuses on planning, structure and systematics.


Nowadays, the issue when conducting research is not necessarily the shortage of valuable information, but rather the abundance of useless information. Accessible databases are so large that, with the incorrect search behaviour, it is a challenge to find the right piece of information. Open Source Intelligence (OSINT) was developed as a research methodology to make sense of the information jungle and produce a selection of information that is validated, reliable, timely, and accurate. With the help of OSINT research techniques and methods it is possible to turn millions of hits with a low relevance into a few hundred hits with high relevance. OSINT-skills are not only relevant for intelligence agencies, but also for employees at a public or private organisation that are occupied with conducting research on a daily basis or even for individuals.

Sign up for our Pathfinder course!

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Our Courses

For whom

The training is relevant for everyone who conducts research using open sources like the internet on a daily basis for his or her work or studies. Think of government agencies like the military (Army, Airforce, Navy, MP), police (detectives), intelligence and security agencies or other agencies that deal with criminality or fraud (customs, welfare agencies, financial task forces) and who can gather a lot of information from open sources in addition to classified sources. Besides, Open Source Intelligence courses are very valuable for businesses who do not have access to government sources. Examples of these businesses are banks, insurance agencies, loan and law firms, consultancy et cetera. Finally, the courses are also suitable for academic researchers, students and international missions (UN missions and EU missions).


Pathfinder Course

The OSINT Pathfinder Course covers the full cycle of online research and search strategies.

  • Reuser's OSINT-research methodology; carry out your research in a planned, structured and systematic manner.
  • Background of OSINT; what is it, what is it not?
  • Technical and strategic backgrounds of the internet as a research tool; organization, setup, management, IP addressing, domain research techniques.
  • How to set up and implement an in-depth, integrated OSINT-research plan in global open sources, not limited to just the WWW.
  • Techniques to protect your information profile, protect your information position and search anonymously.
  • Question analysis and problem construction, techniques to analyze a research topic and to break it down into components.
  • The global open source information landscape. What's out there? What resources are available for OSINT and how do I access them? Commercial sources, libraries, online databases, the Dark web, the Deep web.
  • What other information can be found outside the World Wide Web? 
  • Search strategies to conduct a very systematic and structured research on the Internet.
  • Techniques to reduce millions of hits with low relevance to a few hundred hits with high relevance.
  • The RIS Semantical Table of Twelve to create good keywords for search.
  • Smart Query Build: Maximum Boolean logic, how to build smart queries that will find exactly what you're looking for.
  • Validation techniques to determine the reliability and usability of open source data.
  • The osint pathfinder course is taught entirely in English.
  • And much more.

Note: This course and all teaching materials are in English.

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Master Course

The OSINT Master Course is a refreshment course for people that have passed the OSINT Pathfinder course.

  • On request
  • 2 days of training
  • Added elements on intelligence analysis.
  • The Master is mainly concerned with a full scenario exercise where the student have to apply OSINT Pathfinder capabilities and the Pathfinder methodology.
  • The Master culminates in the presentation and evaluation of the scenario.
  • The Master includes an examination which, when completed positively, leads to the official certificate and title: Certified OSINT Master (COM).
  • Including the examination, the OSINT Master course takes a total of 16 hours.
  • The examination of the Master Course takes place at a different time than the Master course itself.

Note: This course and all teaching materials are in English.

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Consultancy & Lectures

Reuser Information Services (RIS) organises different OSINT-courses, but Arno Reuser himself offers more services. First of all, Arno is an assistant professor Open Source Intelligence at Leiden University and lectures on the OSINT-topic. He gives yearly lectures at Leiden University, but he has also lectured at the University of Kaohsiung in Taiwan. Besides lectures, Arno offers OSINT workshops and seminars to national and international governments, the private sector and academia. Examples of clients are the Dutch Ministry of Justice, the Dutch Ministry of Defence, the Australian Federal Police, the Organisation for the Prohibition of Chemical Weapons (OPCW), Interpol, the European Parliament, Rabobank (a large Dutch national bank), Philips, the University of Amsterdam, the University of Texas and many more. Finally, Arno Reuser is available for consultancy on intelligence in general, intelligence analysis techniques, cyber security, information warfare, information security, internet investigative research techniques and search strategies.

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About Arno Reuser

All OSINT-courses offered by Triangular Group Academy are designed and taught by Arno Reuser, owner and founder of Reuser’s Information Services (RIS). Arno Reuser is an authority in the field of Open Source Intelligence as he was responsible for setting up the OSINT-branch of the Dutch military intelligence agency (MIVD) in the 1990s from the ground up. At that time it was one of the very first OSINT-programmes in Europe. Since then, Arno has used his expertise in setting up his own company to meet the increasing worldwide demand for knowledge on Open Source Intelligence. Reuser’s Information Services has given OSINT lectures, workshops and training programmes to national and international governments, the private sector and academia. Currently, he is also an OSINT guest lecturer at Leiden University, and he has given multiple interviews and written academic articles.

Besides organising and teaching OSINT-courses, Arno Reuser offers a wide variety of other services. As an experienced lecturer he gives inspiring lectures and seminars. Furthermore, he is a consultant on intelligence, security and Open Source Intelligence. In addition to his knowledge on OSINT, Arno is specialised in intelligence in general, cyber security, information warfare, and information security. Reuser's Information Services (RIS) was founded in 2008 by Arno Reuser and partnered with Triangular Group Academy in 2020. 

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Our OSINT courses

Pathfinder Course

  • 3 days
  • Basic training for beginners and advanced researchers


  • 2021 | 21, 22 & 23 September (FULL, register for waiting list)
  • 2021 | 16, 17 & 18 November
  • 2022 | 18, 19 & 20 January
  • 2022 | 15, 16 & 17 March
  • 2022 | 17, 18 & 19 May
  • 2022 | 12, 13 & 14 July
  • 2022 | 13, 14 & 15 September
  • 2022 | 15, 16 & 17 November


Arno Reuser



  • Extensive lunch and snacks
  • Icebreaker session on the first night (network meeting incl. food & drinks)
  • RIS OSINT Research Machine
  • RIS OSINT Handbook
  • Online Training Website
  • One year acces to the RIS helpdesk
  • OSINT Pathfinder certificate

Novotel City Center Hotel | The Hague | The Netherlands

09:00 - 17:00

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In-company Course

  • Bespoke
  • On request
Contact us!

Good intelligence is the key to decision making.

Arno Reuser

OSINT Autoriteit, Docent

Onze klanten vertellen

"This course has been the most relevant to my day-to-day job that I have ever attended. I will use what I have learnt on a daily basis. I would definitely recomment this course to others!"

Cursist, OSINT Pathfinder Course

"This should be a mandatory training for everyone conducting internet-based research."

Cursist, OSINT Master Course

"I very much enjoyed the course. The teacher was excellent! A very good instructor."

Cursist, OSINT Scout Course

"Wow! Top training, really puts your mind to work."

Cursist, OSINT Pathfinder Course

"This course has made me realise how amateur my research methods have been. I wish I had this training 4 years ago! This has been the most practical/applicable training I have received so far."

Cursist, OSINT Pathfinder Course

The world contains two groups of people; the ones that are educated by Arno Reuser and the ones that aren't... and that's factual. Keep on teaching Arno!

Cursist, OSINT Pathfinder Course


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