Introduction To Optimization.- Socio-Inspired Optimization Using Cohort Intelligence.- Cohort Intelligence For Constrained Test Problems.- Modified Cohort Intelligence For Solving Machine Learning Problems.- Solution To 0-1 Knapsack Problem Using Cohort Intelligence Algorithm.- Cohort Intelligence For Solving Travelling Salesman Problems.- Solution To A New Variant Of The Assignment Problem Using Cohort Intelligence Algorithm.- Solution To Sea Cargo Mix (Scm) Problem Using Cohort Intelligence Algorithm.- Solution To The Selection Of Cross-Border Shippers (Scbs) Problem.- Conclusions And Future Directions.