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<p>Combining the score of different recommendation components numerically.<br/>
*<b>Switching</b>: Choosing among recommendation components and applying the selected one.<br/>
*<b>Mixed</b>: Recommendations from different recommenders are presented together to give the recommendation.<br/>
*<b>Cascade</b>: Recommenders are given strict priority, with the lower priority ones breaking ties in the scoring of the higher ones.<br/>
*<b>Meta-level</b>: One recommendation technique is applied and produces some sort of model, which is then the input used</p><p>
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