Now it is no exaggeration to say that "Amazon.com" is a lifeline of our family, In fact, the utilisation ratio become higher day by day.

The problem is that I cannot confirm a product with my five senses. Especially, it is difficult to check the design and strength,

In my case, I often purchase communication or computing devices (hub router and Raspberry Pi, for example). Therefore I don't need to care of the design of product.

Contrary, I will care the performance, usability and error rate of incidence.

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I should rely on the evaluation of purchaser.

In the case of Amazon.com, There are two way, "number of star" and "purchaser's comment"

They can decide the number of star. One star is the lowest evaluation and five stars is the highest evaluation. And the purchasers can add their comment without restrictions.

However this "without restriction" annoys me, because the decoding of comments are very difficult.

For an evaluation system, like above, a room for "fake" comment is large. Basically, the comment must be subjective.

Even both bad and good of evaluation, are likely to guide a principle of "large number"

Therefore, I think I should prepare myself for the worst, that is "I don't expect the correct and fair evaluation from this system".

(To be continued)