如果沒有專家的協助，身心障礙者很難自行找到合適自己的電腦輔具。Anson曾經發展一種決策樹方法，使用49個評估身心障礙者機能程度的選項，以建議其選用26種電腦輔具類別。職能治療師或身心障礙者可以透過這些問題的評估結果來找尋適合的電腦輔具。然而Anson所發展的決策樹沒有明確區分出點選輸入與文數字輸入輔具，且同一命題常重複不斷的出現；因此，本研究擬切割Anson的決策樹成為互斥的獨立子樹來配合身心障礙者的實際需求，這包括身心障礙的電腦使用者可能需要數字輸入、點選、感官輸出和績效提昇等設備。
本研究使用6個身心障礙使用者對分割後的決策樹進行測試以驗證新的決策樹可以使用，較少的評估問題可以有效率的提供一組更完整的電腦輔具組合，經過分割後的子樹，也被證實有能力將新的輔具類別增加到決策樹中以擴增原決策樹來反應最新的科技輔具狀況。諸如本研究這樣修整決策樹和決策表的過程和結果也可以被應用來發展其它決策支援系統。

Disable users without expertise in assistive technology have problems in finding an appropriate assistive device for computer access. Anson developed a decision tree of 49 evaluative questions to access functional capabilities of the disable user and come up with a total of 26 assistive devices for computer access. The occupational therapists or disabled users had to go through repetitive questions in order to find an appropriate device. Therefore, the current research divide Anson’s decision tree multiple independent subtrees to meet the actual demand of disable users. That is a disabled user may require alphanumeric and pointing device, output device and performance enhancement. The decision tree was tested by seven disable users to prove that the new decision tree can provide a complete set of assistive devices for computer access with a smaller number of evaluative questions. How to insert new categories of computer related assistive devices were elaborated to make sure the decision tree can be expanded and updated. The process and results of trimming the decision tree and decision table can be applied to the development other types of decision support systems.

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