In this paper, we are going to study Training and Development as a Concept, why companies need training and development, and why most of the time training and development as a concept has swayed from internal models to external models. The paper proceeds with a Literature Review of world-class articles on training and development. These articles focus on concept and change in the environment which focuses on internal as well as the external mode of trainers. Authors suggest the innovative theories and strategies of training and development in general and in- house training modules in specific which are accepted and much celebrated all over the world. One part of the paper talks about Reasons for Change in the approach by organizations from external training models to in-house training models. To understand more about organizations' approach with respect to this change, Primary Research was conducted, which gives us the basic idea of their perspective of this shift. As a part of secondary research, we were able to go through the previous studies conducted in a similar domain. The analysis of secondary research helped understand the evolution of training and development modules and also the trend in contemporary patterns.