In this sprawling post by Preben Ormen, the subjects of Projects, project management, resource allocation, best practices, and risk management, and personal experience in each. Ormen makes sure to explain the when and how of planning and risk management, creating quick paragraphs to mention both:
The detailed planning should be restricted to the most immediate, upcoming phase. The exact size of this planning horizon should be set according to the specific risks and uncertainties faced specifically within this planning period. The idea is that some risks and uncertainties are relevant only for certain periods. This means that we can selectively chose [sic] to focus our attention specifically on those risk and uncertainties that are most relevant in the current planning period.