This essay will discuss Enterprise Resources Planning (ERP) implementation, specifically in the factors which can leads that ERP implementation to successful and unsuccessful ERP implementation. The difficulties in the ERP implementation had made the ERP become major research when talking about ERP. In what are the key factors that can result in successful and unsuccessful of ERP implementation. By collected all the necessary resources we are be able to discuss more about ERP and the key factors in that in order to make the final conclusion for ERP. In the end the successful and unsuccessful are affected by several factors that explain in this essay. INTRODUCTION The development of the people these days had an affect in the development in the business world as well. People try to find the systems which can be use to help them in running the business for example to reduce the cost in running the business. Since 1950s the computer system had been use to cost. At the moment, Enterprise resources planning (ERP) systems had become important systems in the modern business world. The meaning of ERP itself is an integrated software package composed by a set of standard functional modules (production, sales, human resources, finance, etc.) developed or integrated by the vendor that can be adapted to the specific needs of each customer (Esteves et al. 2000). ERP is a business system that joins all the aspects in the business world such as planning, manufacturing, sales and marketing, projects. The ERP has become more popular in the software which used to help the business actives including order tracking, customer service, finance, inventory control and human resources. The ERP databases contain all the data about the business whi... ... middle of paper ... ...l for enterprise resource planning implementation¡±, Proceedings of the 7th European Conference on Information Systems, Vol. 1, pp. 273-97. Roberts, H.J. and Barrar, P.R.N. (1992), ¡°MRPII implementation: key factors for success¡±, Computer IntegratedManufacturing Systems, Vol. 5 No. 1, pp. 31-8. Rosario, J.G. (2000), ¡°On the leading edge: critical success factors in ERP implementation projects¡±, BusinessWorld, Philippines. Ross J.W. (1999), ¡°Surprising facts about implementing ERP¡±, IT Pro, Vol. July/August 1999. Sam D. (2000), ¡°ERP system flushes bottleneck at Bradley Corp.¡±, Midrange Systems, 18 October, Vol. 12 i15 p36. Stair, R.M., Reynolds, G.W., Gelinas, J.U. Jr., Sutton, S.G., Hunton, J.E., Albright, S.C., Winston, W.L. & Zappe, C. (2007) Accounting Information Systems and Financial Modelling, Thomson, South Melbourne, Victoria, Australia.