JIT_V1_N1_RP1 Luka M. MUSANGU Raymond M Kekwaletswe Journal on Information Technology 2277-5250 1 1 11 23 External Environment, Environmental Uncertainty, Environmental Dynamism, Planning Process, Strategic Information Systems Planning Success This study investigated the influence of environmental dynamism in the relationship between planning process and SISP success in manufacturing and non-manufacturing SBs. Based on responses from 118 South Africa CIOs or head of IS/IT, our empirical investigation provided the following results: of all eleven hypotheses tested, nine were supported and two were not. The findings of study demonstrate that environmental dynamism is more influential in non-manufacturing enterprises than in manufacturing enterprises, the implementation of planning process is strongly leading to the success of SISP in manufacturing enterprises than in non-manufacturing and environmental dynamism influence more the relationship between planning process and SISPS in manufacturing enterprises than in non-manufacturing enterprises. The implications and limitations of this study are also discussed. December 2011 - February 2012 Copyright © 2012 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=1706