隨著電子商務的快速發展，產品的呈現角度將直接影響消費者的購買意願。適當的呈現角度，將使消費者對於產品的認知更接近實體產品，並進一步降低消費者的知覺風險。因此，產品觀測閾值不論在實體展示或平面圖像呈現等，均有其不可忽視的重要性。

本研究以產品全角度的影像呈現方式，找出一般人能辨識的產品觀測閾值。藉由專家訪談找出可能影響產品觀測閾值的因子－「熟悉度」和「產品構件」，再以此兩因子進行影響產品觀測閾值因素之探討。以Nokia8250為目標手機，並於前測中找出構件差異之對比手機，續以問卷將受測者依熟悉度進行分組，最後統計受測者的觀測閾值及最喜好的產品呈現角度。

本研究的具體結論為：
(1). 產品觀測閾值在分佈圖上均呈現X形分佈，而分佈圖的二側則較不易
辨識。更進一步的分析，其可分為三個主要範圍：
範圍一：X介於-60度到165度之間與Y介於-75度到75度之間交集的範圍。
範圍二：X介於45度到255度之間與Y介於105度到255度之間交集的範圍。
範圍三：當Y=90度時，X介於45度到165度之間；當Y=270度時，X介於30度到150度之間。
(2). 熟悉度會影響產品觀測閾值，而構件差異對於觀測閾值來說並不顯著。熟悉者的可觀測閾值明顯優於不熟悉者，熟悉者容易掌握產品的微小特徵，故對於產品呈現角度可辨識的範圍較為寬廣。
(3). 受測者最喜好的觀測角度均為產品呈現右旋及上轉的傾斜角度，並座落於範圍一內。目標手機的呈現角度在X=30度,Y=30度、X=30度,Y=15度及X=30度,Y=45度獲得多數受測者喜好；而對比手機的呈現角度在X=45度,Y=15度、X=30度,Y=15度及X=30度,Y=30度獲得多數受測者喜好。
(4). 在產品的六個構面中，構件數較少（或無構件）的構面會因為無法提供可供參考的特徵導致受測者無法辨識；而擁有充份構件的構面其觀測閾值則較為寬廣。

The presentation angle of products has become an important issue following the proliferation of electronic commerce, due to the fact that the presentation angle of products highly influences consumers’ evaluations and willingness to purchase. Appropriate presentation angles that are near reality in cognition efficiently reduce consumers’ perceived risk.

This paper adopts image presentation in all angles to find out the observation threshold of presentation angels for cellular phones and its related factors. By means of consulting professors in universities we gained two factors - familiarity with objective and product component. Using the Nokia 8250 cellular phone as the objective tool, after that the preceding experiments is proceeding as planned to find out contrasting components with the Nokia
8250. Then use questionnaire method to divide subjects into two groups according to familiarity. Finally, compile statistics with observation threshold and the most favorable presentation angles for cellular phone.

By summarizing the observation threshold experiment and the subjects rating questionnaire, the author have obtained some conclusions, showing as follows:
(1)Observation threshold of cellular phones are showing as X on the distribution graph. To go a step further to analyze, they can be divided into three main ranges:
Range 1: the union of the X axle between -60°and 165°and the Y axle between -75°and 75°.
Range 2: the union of the X axle between 45°and 255°and the Y axle between 105°and 255°.
Range 3: When Y axle =90°, the X axle lies between 45°and 165°.
When Y axle =270°, the X axle lies between 30°and 150°.
(2)The influence of observation threshold on familiar factor is conspicuous; the component factor is inconspicuous on the contrary. People who have greater familiar with products know the characteristics of products better, therefore show a more extensive observation threshold.
(3)Most subjects favor a clockwise or up turned presentation angle, situated within range 1.
Most subjects favor presentation angles of X=30°and Y=30°, X=30°and Y=15°, X=30°and Y=45°for the Nokia 8250 cellular phone. Most subjects favor presentation angles of X=45°and Y=15°,X=30°and Y=15°,X=30°and Y=30°for the contrasting cellular phone.
(4)Products with less or none components to consult, it is harder for subjects to Identify due to the lack of characteristics of reference. On the contrary, products
With more components can be easily recognized from different viewpoints.

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參考網站
http://taiwan.cnet.com/news/comms/story/0,2000022641,20030728,00.htm
http://www.moeaboft.gov.tw/impt_issue/impt_6/ec-rept19-10.ht