With the ever-increasing number of vulnerabilities and threats against systems and networks, one would wonder the best way to make systems more trusted. In reality, there is no best way because the causes of the problems have been overlooked. The author gives more than 15 answers on why such problems happen. In this review, I look at the five most important causes.

First, hardware that is not properly built with secure components can be easily compromised, and many systems are flawed. Cryptography and error-correcting codes will fail.

Second, software engineering education does not adequately prepare students for increasing the trustworthiness of networks and systems. It needs to be revamped.

Third, Internet of Things (IoT) trustworthiness is not fully achieved. This is partially due to hardware limitations in IoT devices.

Fourth, storing data in cloud computing will not always make your systems more secure. Storage migrated from local hardware that has been compromised is vulnerable to remote attacks.

Fifth, human issues such as personal privacy are overlooked or are not given importance. One solution is to consider the issues in software engineering.

The author presents his views on how to increase system trustworthiness in an informal, organized way. Pictorial examples of some of his views would have been helpful. Those interested in the challenges of increasing system trustworthiness should read this article.