Project management skills

I'd remarked to my supervisors that a project manager doesn't need technical skills, but they have queried it.

Gray says that a project manager needs "only rudimentary technical skills" {Gray, 2008} but goes on to remark that he/she also needs orchestrating skills to get people to make the right decisions at the right time. I want to find some public sector literature that remarks on the skills that a project manager needs. There is probably something on the OGC site and probably something in PRINCE2. The OGC site on project manager gives responsibilities, skills and attributes. It also has a concise diagram of where the PM fits in.

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Gray, C. F. and Larson, E. W. (2008) Project management: the managerial process, (4 Edn), McGraw-Hill, NY. 798