There are many ways to approach legacy modernization that will help bring the agility and adaptability needed without causing major business disruptions. Usually, a phased approach is considered as a smart and intelligent way to legacy transformation. However, the best method for you will depend on your unique business challenges with obsolete systems and the goals against each issue. It is vital to analyze your legacy system against your business goals and needs before making any investment. However, the ideal approaches to modernize mission critical legacy systems include following the below practices. 1)Extending your business systems capabilities with needed features 2)Migrating to modern environments 3)Replacing existing legacy systems gradually