The standard for portfolio management 4th edition

全英文，第四版，pmi官方文档 很好的学习资料。 If project and program management are disciplines for doing the work right, portfolio management is the discipline for doing the right work. Portfolio managers oversee a collection of projects, programs and other activities that are grouped together to meet strategic business objectives. The practice of portfolio management is integral to the implementation of an organization’s overall strategic plan.