What is it? Why is it important?

The Site-Investigator (Site-INV) is responsible for the conduct of a study at a particular study site.


The Site-INV implements the study according to a EC approved study protocol provided by the SP-INV (e.g. the Site-INV agrees by dating and signing the approved study protocol)


With respect to Data Management (DM) responsibilities, the Site-INV:

  • Provides feedback to the SP-INV regarding the implementation of the study database (eCRF) at the study site
  • Delegates data entry tasks to qualified and trained local staff (e.g. data handling, data query management)
  • Ensures data entered into the study database during study conduct is of high quality
  • Ensures data confidentiality by informing the SP-INV regarding changes in local staff (e.g. provide database access to new staff responsible for data entry, remove access from staff leaving the study)

What do I need to do?

As a SP-INV planning a multi-centre study,  establish a requirement profile of participating Site-INVs who:

  • Are able to implement required study procedures (e.g. study design, applicable randomisation procedures)
  • Can provide required infrastructure, resources, and disposable free time required for study conduct
  • Have access to competent supporting staff (e.g. data input operator, study coordinator)
  • Have access to target participants able to fulfill the study inclusion criteria
  • Can guarantee high quality data and timely data entry into the study database 
  • Can ensure the confidentiality and safety of study participants during study conduct

Where can I get help?

Your local CTU can support you with experienced staff regarding this topic

External Links

Swissethics – see in particular

  • Topics/Other Topics/Professional qualifications of the investigator and project leaders of research projects


ICH GCP E6(R2) – see in particular guidelines

  • 1.34 Investigator definition
  • 4.0 Investigator qualifications
  • 5.5 Trial Management, data handling, and record-keeping

Swiss Law

ClinO – see in particular article

  • Art. 6 Professional qualifications

HRO – see in particular article

  • Art. 4 Professional qualifications
  • ClinO - Clinical Trials Ordinance
  • CTU – Clinical Trials Unit
  • DM – Data Management
  • eCRF – electronic Case Report Form
  • HRO - Human Research Ordinance
  • ICH GCP – International Council for Harmonisation - Good Clinical Practice
  • Site-INV – Site-Investigator
  • SP-INV – Sponsor-Investigator
Concept ↦ Data Handling ↦ Stakeholders ↦ Site-Investigator

Provides some background knowledge and basic definitions

Basic Monitoring
Basic Drug or Device

Starts with a study idea

Ends after having assessed and evaluated study feasibility

Concept Drug or Device

Starts with confidence that the study is feasible

Ends after having received ethics and regulatory approval

Development Drug or Device

Starts with ethics and regulatory approval

Ends after successful study initiation

Set-Up Ethics and Laws
Set-Up Quality and Risk
Set-Up Drug or Device

Starts with participant recruitment

Ends after the last participant has completed the last study visit

Conduct Drug or Device

Starts with last study visit completed

Ends after study publication and archiving

Completion Statistics
Completion Drug or Device
Current Path (click to copy): Concept ↦ Data Handling ↦ Stakeholders ↦ Site-Investigator

Please note: the Easy-GCS tool is currently under construction.