The accountability principle requires you to document your compliance with the principles laid out in article 5. This is an essential requirement and can seem somewhat arbitrary.  For every processing activity you already have or plan to start, you should design your processing to comply with these principles.  One way of doing this is to include a description of your compliance with these principles in your records of processing activities (article 30). In many ways, following the requirements in article 30 lets you comply with the accountability principle in article 5.    Employees should follow these principles within your organisation. Therefore training your employees in these principles becomes a tool for compliance and an excellent way to improve data security in practice. Demonstrating that you have trained your employees in these principles is one of the several steps you can take to demonstrate compliance with the accountability principle.