Collective investment management companies use different performance measures to illustrate how well their funds have performed, and investors, financial advisors/planners, portfolio managers and financial reporters are inundated with a continual barrage of these statistics. Furthermore, even renowned statisticians favour different quantitative measures.

Plexus has recognised the need for a system whereby the different quantitative measures used in calculating relative performances are all encompassed in one simple number. Plexus has therefore introduced the Plexus Crown ratings ("PlexCrown ratings") for unit trusts in South Africa.