(eee_8_4)= # Systematic failures In the classification of {term}`failure root causes `, the {term}`systematic failures ` are considered as major contributors to the total anomalies occurring on board of a satellite. For {term}`EEE` components and electronic equipment, the {term}`systematic failures ` are linked mainly to the design and manufacturing errors such as errors during the design of the electronic boards, or during the soldering of {term}`EEE` components on the electronic boards. The FIDES methodology does not consider random and {term}`systematic failures ` separately; all failures are considered as "random" and no specific prediction model for {term}`systematic failures ` is included. {term}`Systematic failures ` are partly addressed and covered in the process questionnaire. However, this questionnaire has not been designed to allow for a clear split between random and {term}`systematic failures `. So, the only way to specifically address {term}`systematic failures ` is to perform a prediction at system level according to the methodology described in Chapter 2.