Since the introduction of the concept of IS capability to IS research, it has been extensively used to explain various IS related studies - for instance: competitive advantage, firm performance, and agility among several others. This extensive use of the concept has resulted in several interpretations and diverse classifications. These discrepancies in combination with the extensive use of the concept put its fundamental logic at the danger of losing its meaning. Using a systematic literature review, this paper highlights the similarities, differences and fragmented knowledge groups and consequently provides a possibility to move towards a unified view of IS capability. To consolidate the fragmented classifications, the paper advances a four ellipse model from prior classification to vividly conceptualize the IS capability construct and hence provide an integrated platform for future research. Keywords: IS Capabilities, Ellipse Model, Literature Review, Innovation and Information Systems/Technology IT/IS Capability Classification