Choosing a number of different projects and a portfolio is complex. Despite this difficulty, selecting the appropriate portfolio of projects is critical as it is the portfolio of projects that determines an organisation’s success, not the completion of an individual project. Refer to the theory by Souder, 1983 and Nonino, 2017, and appraise the criteria for the project selection model that your firm can use. Ensure that you appraise the theory in the context of the project at hand.