產品開發可行性評估是一個衡量產品開發設計專案成功與否的關鍵流程之一。它是在進一步研究、試作和妥善規劃準備的工作之後以所設計的產品如所預期方式規劃進行和完成之可能性，以及在市場可以獲得成功之可能性的評估。
本研究以系統思維破除「見樹不見林」的缺失，全面性考量機上盒產品開發設計可行性評估各關鍵因素和彼此之間因果和相依關係。並以紥根理論配合質性研究資料分析軟體(NVivo 9)，初步歸納可行性評估之要因。採用陰陽五行模型，簡化成五大範疇及二元面向的核心形成5x2模型，發展出標籤化量表以建立「Chernoff faces質量模型」。
本研究以某電子專業代工廠商2011年開發的機上盒產品專案案例資料為研究材料，以「系統思維」作為思想哲學，對可行性評估相關的專案案例事件採取全面性、系統性的考量。使用質性研究方法的紥根理論方法為工具，找出資料中所蘊含可行性評估的重要因素，應用陰陽五行簡化為5x2模型，和標籤化量表評分獲得數據成為Chernoff faces質量模型。臉型各特徵之間呈現核心範疇間彼此的關係。藉由系統五行觀探討這關係，於可行性評估時，有整體觀的評量數據產生「質」與「量」的視覺化臉型呈現和失衡範疇的辨識以及可改善建議之提供。

The stage of development feasibility evaluation is one of key processes to evaluate ahead from the beginning whether a project could most likely turn to a successful product or not. It is to evaluate the possibility of success in market, the possibility of product development as planned after further research for design, implementation, and well-prepared planning.

From the viewpoint of systems thinking it has breaking through not able to see the forest for the trees which allows to see through clearly inside out of Set Top Box (STB) project development feasibility evaluation process and to look inside out all aspect key elements, the cause and effect, and dependencies among others. Then, grounded theory applies with qualitative analysis study software (NVivo 9) to make coding to identify preliminary factors of the feasibility evaluation. The preliminary factors are simplified to form 5x2 model by applying Yi-Yang five element model which is introduced to simply five category with two components. Based on this model, a tagged scale rating system is developed to establish Chernoff faces qualitative and quantitative model.

This study uses a STB Original Design Manufacturing (ODM) developing projects in 2011 as example. Applying systems thinking theory, feasibility evaluation related events are treated as whole and systemic way. By using grounded theory of qualitative study, find out central categories and apply Yi-Yang 5 element theory to simplify as 5x2 model. Tagged scale rating then is introduced to collect data, therefore, Chernoff faces qualitative and quantitative mode is data-driven and shaped. Their relation among the central categories displayed with face features. As a result, at the stage of development feasibility evaluation, it is taken into account as whole and reviewed as systemic way with face features in which qualitative and quantitative are represented. The visual comparison of face features among the new and the products has built up, becomes a clue to identify the unbalanced categories and to suggest the way for their improvements.

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