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TREIO aimed to deliver EU-wide standardized and uniform, yet practical, training curricular and materials on the European Investigation Order (EIO) and its electronic exchange using the e-Evidence Digital Exchange System (eEDES). Further, the Project provided guidelines on the adoption and customization of these training materials to different jurisdictional contexts and legal specifics and procedures taking place on national level.

TREIO training content is designed as modular and multilevel. It addresses judges, investigative judges, prosecutors, members of other competent authorities (as identified in Article 2 of the EIO Directive) and higher administrative staff employed by a judicial authority and involved in the issuing and execution of an EIO. The training materials build on a needs-assessment carried out as part of the TREIO Project which included a literature review of needs and several sessions with person experienced in the field of the EIO.

The aim of the TREIO training set (guidelines, explanatory materials, slide decks, TREIO eEDES simulator exercises etc.) is to provide sufficient materials to be used by trainers to train other professionals to become trainers and/or to use these materials for the training with persons less familiar with the EIO and eEDES.

Training cascading approach

Given that several persons may need to be trained in every Member State, a cascading training methodology has been chosen; that is, the materials are planned to train practitioners on becoming trainers themselves. These trainers will in turn train other practitioners to work with the EIO in the eEDES and so on. This cascading approach will, over time, reach a larger number of persons in every Member State than the one that could possibly be achieved with a one-time, one-moment training.

The transfer of learning in such an approach depends on well-planned trainings; competent, supportive, and prepared trainers; and a feedback/reflection mechanism on the learning process. That is why, the TREIO training set supports trainers in the preparation of the EIO trainings, offering examples and ideas on how to support their participants’ learning path.

Training set evolution

A first group of Master Trainers followed a training based on a earlier version of the training materials presented herein. That training of Master Trainers took place in November – December 2021. Based on that early version an initial TREIO Training Content was developed. The initial TREIO Training Content was used for several TREIO training sessions between May 2022 and January 2024. Based on the experience gained during these trainings, the training materials have been further revised and refined in the final version of the TREIO Training Content.

Training modules presented herein deliver a framework for the national training to be carried out over two half days. However, the suggested curriculum is flexible and can serve as a useful basis for adaptation to varying national contexts and extended training over shorter or longer periods as needed.

Final training set

Present guidelines explaining the framework and all training modules continues with a section explaining the purpose of the training materials, the target audience, the training curriculum’s content, learning objectives, and specific recommendations for trainers carrying out the training.

A separate section delves deeper in the training content providing description of each training module, recommended teaching approaches, learning methods and self-reflection. Accompanying slide decks can be used directly during the training sessions.

Recommended training evaluation materials are also included.

You can find an overview of the training framework in the all-round presentation of the project outcomes available herein.


The present training materials are developed to assist judicial authorities in Member States in the training of colleagues involved in the issuing and executing of EIOs using eEDES. Hence, they take a dual approach combining a training on legal aspects of the EIO with hands-on exercises using the eEDES. The training follows the workflow of the eEDES system focusing on the legal consequences/implications of the different steps along the way.

The training is planned to be interactive, combining structured information blocks with analysis and reflection based on practice and case studies and building on the experience of participants. Instructions to trainers on how to implement the training are provided in a separate document.

Materials prepared for delivery of Module 1 ‘European Investigation Order: Issuing an EIO’ include:

  • Session 1.1 ‘Scope of the EIO as an Instrument’:
    • Guiding materials (Appendix 1)
    • Slide deck (Appendix 2)
  • Session 1.2 ‘Issuing an EIO’:
    • Guiding materials (Appendix 3)
    • Slide deck (Appendix 4)
  • Session 1.3 ‘Investigative Measure(s)’:
    • Guiding materials (Appendix 5)
    • Slide deck (Appendix 6)
  • Session 1.4 ‘Grounds for Issuing an EIO’:
    • Guiding materials (Appendix 7)
    • Slide deck (Appendix 8)
  • Session 1.5 ‘Transmitting an EIO’:
    • Guiding materials (Appendix 9)
    • Slide deck (Appendix 10)
  • Session 1.6 ‘Take-home Tasks’:
    • Guiding materials (Appendix 11)
    • Slide deck (Appendix 12)
    • TREIO eEDES Simulator exercises (separate set of materials)

Materials prepared for delivery of Module 2 ‘European Investigation Order: Receiving and Executing an EIO’ include:

  • Session 2.1 ‘Reflection on Using eEDES’:
    • Guiding materials (Appendix 13)
    • Slide deck (Appendix 14)
  • Session 2.2 ‘Receiving EIO’:
    • Guiding materials (Appendix 15)
    • Slide deck (Appendix 16)
  • Session 2.3 ‘Recognition and Execution of an EIO’:
    • Guiding materials (Appendix 17)
    • Slide deck (Appendix 18)
  • Session 2.4 ‘Notification of Interception of Telecommunications and MLAs’:
    • Guiding materials (Appendix 19)
    • Slide deck (Appendix 20)
  • Session 2.5 ‘Reflections on the Learning Process’:
    • Guiding materials (Appendix 21)
    • Slide deck (Appendix 22)

Additional materials (Appendix 23) include:

  • summaries of preliminary reference procedures and judgements from the Court of Justice of the European on the interpretation of certain articles in the EIO Directive (up to date until April 2022)
  • short list of relevant EU legislation
  • short list of relevant documents explaining the EIO practices in Member States
  • short list of academic journal articles referring to different aspects of the EIO.

Evaluation materials, part of the set, refer to:

  • pre-training evaluation questionnaire (Appendix 24)
  • post-training evaluation questionnaire (Appendix 25).

Notes: The training set presented herein has been translated into Bulgarian using professional translation services. The materials have been validated by a native speaker (legal expert) - a representative of the project, and the Bulgarian Master Trainers.


  • Training instructions
  • Training set
    • Module 1 ‘European Investigation Order: Issuing an EIO’ (guiding materials and slide decks)
    • Module 2 'European Investigation Order: Receiving and Executing an EIO' (guiding materials and slide decks)
    • Additional materials
    • Evaluation materials
  • TREIO eEDES Simulator exercises

Disclaimer: The training set presented herein has been translated into Croatian using professional translation services. The set has not been validated by a native speaker - a representative of the project, but Croatian Master Trainers validated its content.

  • Training instructions
  • Training set
    • Module 1 ‘European Investigation Order: Issuing an EIO’ (guiding materials and slide decks)
    • Module 2 'European Investigation Order: Receiving and Executing an EIO' (guiding materials and slide decks)
    • Additional materials
    • Evaluation materials
  • TREIO eEDES Simulator exercises

Disclaimer: The training set presented herein has been translated into Czech using professional translation services. The set has not been validated by a native speaker - a representative and/or an associate of the project.

  • Training instructions
  • Training set
    • Module 1 ‘European Investigation Order: Issuing an EIO’ (guiding materials and slide decks)
    • Module 2 'European Investigation Order: Receiving and Executing an EIO' (guiding materials and slide decks)
    • Additional materials
    • Evaluation materials
  • TREIO eEDES Simulator exercises

Disclaimer: The training set presented herein has been translated into Dutch using professional translation services. The set has not been validated by a native speaker - a representative and/or an associate of the project.

  • Training instructions
  • Training set
    • Module 1 ‘European Investigation Order: Issuing an EIO’ (guiding materials and slide decks)
    • Module 2 'European Investigation Order: Receiving and Executing an EIO' (guiding materials and slide decks)
    • Additional materials
    • Evaluation materials
  • TREIO eEDES Simulator exercises

Disclaimer: The training set presented herein has been translated into Finnish using professional translation services. The set has not been validated by a native speaker - a representative and/or an associate of the project.

  • Training instructions
  • Training set
    • Module 1 ‘European Investigation Order: Issuing an EIO’ (guiding materials and slide decks)
    • Module 2 'European Investigation Order: Receiving and Executing an EIO' (guiding materials and slide decks)
    • Additional materials
    • Evaluation materials
  • TREIO eEDES Simulator exercises

Disclaimer: The training set presented herein has been translated into French using professional translation services. The set has not been validated by a native speaker - a representative of the project, but representatives of the French Ministry of Justice validated its content.

  • Training instructions
  • Training set
    • Module 1 ‘European Investigation Order: Issuing an EIO’ (guiding materials and slide decks)
    • Module 2 'European Investigation Order: Receiving and Executing an EIO' (guiding materials and slide decks)
    • Additional materials
    • Evaluation materials
  • TREIO eEDES Simulator exercises

Notes: The training set presented herein has been translated into German using professional translation services. The materials have been validated by a native speaker (legal expert) - a representative of the project, and the Austrian Master Trainers.

  • Training instructions
  • Training set
    • Module 1 ‘European Investigation Order: Issuing an EIO’ (guiding materials and slide decks)
    • Module 2 'European Investigation Order: Receiving and Executing an EIO' (guiding materials and slide decks)
    • Additional materials
    • Evaluation materials
  • TREIO eEDES Simulator exercises

Notes: The training set presented herein has been translated into Greek using professional translation services. The materials have been validated by a native speaker (legal expert) - a representative of the project, and the Greek Master Trainers.


  • Training instructions
  • Training set
    • Module 1 ‘European Investigation Order: Issuing an EIO’ (guiding materials and slide decks)
    • Module 2 'European Investigation Order: Receiving and Executing an EIO' (guiding materials and slide decks)
    • Additional materials
    • Evaluation materials
  • TREIO eEDES Simulator exercises

Notes: The training set presented herein has been translated into Italian using professional translation services. The materials have been validated by a native speaker (legal expert) - a representative of the project, but have not been validated by a representative of an Italian competent authority.

  • Training instructions
  • Training set
    • Module 1 ‘European Investigation Order: Issuing an EIO’ (guiding materials and slide decks)
    • Module 2 'European Investigation Order: Receiving and Executing an EIO' (guiding materials and slide decks)
    • Additional materials
    • Evaluation materials
  • TREIO eEDES Simulator exercises

Disclaimer: The training set presented herein has been translated into Lithuanian using professional translation services. The set has not been validated by a native speaker - a representative and/or an associate of the project.

  • Training instructions
  • Training set
    • Module 1 ‘European Investigation Order: Issuing an EIO’ (guiding materials and slide decks)
    • Module 2 'European Investigation Order: Receiving and Executing an EIO' (guiding materials and slide decks)
    • Additional materials
    • Evaluation materials
  • TREIO eEDES Simulator exercises

Notes: The training set presented herein has been translated into Portuguese using professional translation services. The materials have been validated by a native speaker (legal expert) - a representative of the project, and the Portuguese Master Trainers.

  • Training instructions
  • Training set
    • Module 1 ‘European Investigation Order: Issuing an EIO’ (guiding materials and slide decks)
    • Module 2 'European Investigation Order: Receiving and Executing an EIO' (guiding materials and slide decks)
    • Additional materials
    • Evaluation materials
  • TREIO eEDES Simulator exercises

Disclaimer: The training set presented herein has been translated into Romanian using professional translation services. The set has not been validated by a native speaker - a representative of the project, but the content has been validated by representatives of the Prosecutor's Office attached to the Romanian High Court of Cassation and Justice (Romania).

  • Training instructions
  • Training set
    • Module 1 ‘European Investigation Order: Issuing an EIO’ (guiding materials and slide decks)
    • Module 2 'European Investigation Order: Receiving and Executing an EIO' (guiding materials and slide decks)
    • Additional materials
    • Evaluation materials
  • TREIO eEDES Simulator exercises

Disclaimer: The training set presented herein has been translated into Slovak using professional translation services. The set has not been validated by a native speaker - a representative and/or an associate of the project.

  • Training instructions
  • Training set
    • Module 1 ‘European Investigation Order: Issuing an EIO’ (guiding materials and slide decks)
    • Module 2 'European Investigation Order: Receiving and Executing an EIO' (guiding materials and slide decks)
    • Additional materials
    • Evaluation materials
  • TREIO eEDES Simulator exercises

Disclaimer: The training set presented herein has been translated into Slovenian using professional translation services. The set has not been validated by a native speaker - a representative and/or an associate of the project.

  • Training instructions
  • Training set
    • Module 1 ‘European Investigation Order: Issuing an EIO’ (guiding materials and slide decks)
    • Module 2 'European Investigation Order: Receiving and Executing an EIO' (guiding materials and slide decks)
    • Additional materials
    • Evaluation materials
  • TREIO eEDES Simulator exercises

Notes: The training set presented herein has been translated into Spanish using professional translation services. The materials have not been validated by a native speaker (legal expert) - a representative of the project, but the content has been validated by the Spanish Master Trainers.

  • Training instructions
  • Training set
    • Module 1 ‘European Investigation Order: Issuing an EIO’ (guiding materials and slide decks)
    • Module 2 'European Investigation Order: Receiving and Executing an EIO' (guiding materials and slide decks)
    • Additional materials
    • Evaluation materials
  • TREIO eEDES Simulator exercises

Disclaimer: The training set presented herein has been translated into Swedish using professional translation services. The set has not been validated by a native speaker - a representative and/or an associate of the project.

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