Figure 4
The bar graph compares the frequency of different evaluation methods used in studies. It features five vertical bars representing different methods: Case Study, Prototype Implementation, Expert Review, Comparative Analysis, and Simulation. The x-axis is labeled 'Evaluation Method' and the y-axis is labeled 'Number of Studies (n)'. The Case Study method is the most frequent, with over 50 studies. Prototype Implementation follows with around 30 studies. Expert Review is next with approximately 25 studies. Comparative Analysis has about 15 studies, and Simulation is the least frequent with around 5 studies. All values are approximated.Shows evaluation methods and their frequency as employed by studies