*3.1. Planning Review*

The planning of the review was based on the research questions and their objectives. Analyzes of IoT and WSN were conducted to show their importance in daily life. The use of smart and appropriate devices has been studied in this field but still needs critical analysis. Therefore, it is important to make a systematic review article in this realm, especially related to IoT and WSN, to show future directions. Therefore, we established the search technique, search strings, inclusion/exclusion criteria, and quality assessment criteria for the papers collected from different repositories. Figure 4 shows the step of our proposed review planning process.

**Figure 4.** Planning process of systematic literature review (SLR).
