Table 5.

Inclusion and exclusion criteria.

Inclusion Criteria
1	Include only those papers written in the English language.
2	Include papers that were published in 2014–2021.
3	Include papers that reflected enough knowledge about the search strings and search objectives.
4	Include papers whose titles, keywords, abstracts, and conclusions provided enough information related to WSN, IoT, and IR 4.0.
5	Include papers whose content focused on WSN, IoT, and IR 4.0 content and provided in depth insights.
Exclusion Criteria
1	Exclude papers written in a language other than the English language.
2	Exclude gray papers.
3	Exclude papers that were not published within 2014–2021.
4	Exclude research papers containing less than three pages.
5	Exclude papers that failed to meet the inclusion criteria.