**5.1 Literary issues**

The database identification was first challenge to identify supporting literature. Scopus a largest database of academic articles was primary focus in collection of articles from journals. The published articles on specific bio-inspired algorithm searched for publication number from 2008 to 2020. During search process name was considered as keyword. Obtained results were analysed for algorithm, document-wise and subject wise. Documents are categories are article, conference paper, review, book and others. More research publication in different categories can be found based on bio-inspired algorithms PSO and GBA compared to other emerging algorithms which is plotted in **Figure 13**. To have clear view of published article year wise plot was plotted as shown in **Figure 14**. The evolution of algorithms is clearly shown in **Figure 14**. More publications have established algorithm PSO and GBA and on other remaining algorithms publications are comparatively low hence more research can be carried on to identify suitable optimization position for this algorithms.
