The paper in question is Peter Keen's "Information Systems and Organizational Change" (1 Keen). This is considered a classic paper in software engineering, I'm studying it right now for a retrospective on a project that has been difficult. The paper is about why the implementation of MIS (management information science) systems can be difficult from a sociological and political science perspective.

I'm having trouble understanding what he means by pluralism, especially with relation to counterimplementation.

Here is a link to the paper in full:
https://pdfs.semanticscholar.org/41c0/5e6c2cd210bb67b64adbebfb3f16fec33e58.pdf