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The successful delivery of organisational objectives is significantly linked to the effective collection of project portfolios. There are many different multi-criteria decision making (MCDM) methods available which can be used to calculate examine and select project portfolio management (PPM) decision options. However, finding the most suitable one is a challenging task which requires a constructive review and comparison of existing PPM MCDM approaches. This study identifies the strengths and weaknesses of MCDM methods for assisting in PPM decision making. Of more than 100 methods identified in more than 1,400 publications, eight [analytic hierarchy process (AHP), analytic network process (ANP), data envelopment analysis (DEA), dominance-based rough set approach (DRSA), elimination and choice expressing the reality (ELECTRE), preference-ranking organisation method for enrichment evaluations …