An overview Part I Testing is a very big process of software development life cycle. I am just giving overview in my blogs. I have divided my blog in nine parts. Here is the first part. 1. Evolution of Software Testing The ability to produce software in a cost-effective way is the key factor that determines the effective functioning of the modern systems. To produce cost effective software a number of activities were in practice. The attitude towards Software testing underwent a major positive change in the recent years. In 1950’s when machine languages were used testing is nothing but debugging.1960’s Compilers were developed, testing started to be considered as a separate activity from debugging. In 1970 ‘s when Software engineering concepts were introduced ,software testing began to evolve as technical discipline Over the last two decades there has been an increased focus on the better, faster, cost-effective, secured software. This has increased the acceptance of testing as a technical discipline and also a career choice 2. What is Software Testing? The process of exercising the software or part of the software by a set of inputs to check whether the results are obtained as required. Software is the process used to identify the correctness, completeness and quality of developed software. It is a means of evaluating the system or a system component to determine that it meets the requirement of the customer.