Once the requirements analysis is complete, the specification can be written. It should take place very early in the design and development process.
Just how concrete other requirements for the usability and the UI have to be is not specified in the IEC 62366:2015. All use scenarios must be defined and evaluated with regards to safety.
Therefore, the focus here is on security, effectiveness, efficiency and satisfaction, in order to later ensure smooth interaction between the user and the product.
We are happy to support you through collaboration in creating the usability specifications, because a specification that is as precise as possible is the basis for all further development activities.
The verification of the specifications then takes place in the further development process.