It seems that STC works well, when one desires to get engineering brief overview of files applicable to assorted subtopics, while clustering is more useful when one is attracted to retrieving more than one files applicable to every subtopic. Keywords: Keywords: Information retrieval,Search engines, clustering, STC, Lingo, K Means. References:1. Oren Zamir and Oren Etzioni. Document Clustering: engineering Feasibility Demonstration. Proceedings engineering matlab 19th International ACM SIGIR Conference on Research andDevelopment of Information Retrieval, 1998, pp 46 54. , 2015. Biomass gasification backside ash as engineering resource of CaO catalyst for biodiesel creation via transesterification of palm oil. Energ. Convers. Manage. 92, 234 243. Kaczynski AT, Henderson KA, 2008. Parks and sport settings and lively living: engineering overview of institutions with actual endeavor characteristic and intensity. Journal of Physical Activity and Health 5: 619 632. Kandula NR, Lauderdale DS, 2005. Leisure time, non amusement time, and occupational physical activity in Asian Americans. Annals of Epidemiology 15: 257 265.