This part of the 61857 series is focused on applications where other possible factors need to be incorporated to evaluate any influence on the performance of the EIS. Multi-factor evaluation is the most complex type of project to design and conduct. Clear guidelines are needed to give the user of this standard a uniform approach and a method to analyse the test results. This standard is for applications where the stresses are some combination of other factors of influence identified in IEC 60505. The multi-factor stresses are applied during the diagnostic portion of each test cycle. A few examples of other factors of influence or multi-factor stresses are: - High vibration - Submersion in oils, water, or solutions - Voltage higher than the test voltage of the reference EIS - Decreased cold shock temperature