Table 2 Categories for extracting relevant data used for the descriptive and thematic analysis

Descriptive

Publication date

Year of publication

Journal

Name of journal

Author

Authors name

Title

Full title of paper

Geographical distribution

Country/continent of origin, inland waterway researched

Thematic

KPIs related to nautical bottlenecks (and their rehabilitation)

Knowledge about different KPIs and how they are influenced by the rehabilitation of nautical bottlenecks