A method for assuring performance of applications is described herein. According to an implementation, the method includes obtaining at least one performance requirement associated with an application in a pre-development phase of a development lifecycle of the application. The performance requirement is mapped with one or more of functional requirements associated with the application and the performance requirement is analyzed based at least on an operational load expected to be handled by the application during operation. Further, the application is developed based on the performance requirement and the mapping. At least one performance characteristic associated with the application is determined, to compare against the performance requirement assuring performance of the application during operation.