This is the simplest portfolio William Bernstein discusses in his famous book The Intelligent Asset Allocator. The book is widely recommended not only for this portfolio, but also for its technical and thorough discussion on diversification and portfolio construction in general.
Localized portfolio versions are organized by home country
|25%||Large Cap Blend||USA-LCB||EUR-LCB||EUR-LCB||USA-LCB|
|25%||Small Cap Blend||USA-SCB||EUR-SCB||EUR-SCB||USA-SCB|
|25%||Short Term Bonds||CAN-ST||GER-ST||UK-ST||USA-ST|
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Change the home country to translate the portfolio to local assets, currency, and inflation