Product design involves a number of general steps. Specialists from all relevant disciplines are involved in
each of these steps:

• User requirements
• Ideas, principles
• Proof of principle
• Functional prototype
• Rework feedback from end users
• Pilot series
• Rework feedback from end users
• Product series

Important considerations when designing user interfaces

• Intuitive → habituation, only showing relevant and understandable controls, consider users expectations
• Logical → the user follows the correct path without consulting manuals and is allowed to make mistakes without being punished, present usable feedback to user
• Comfortable → color, object and font settings, spatial memory and streamlined repetition
• Organizing → visual flow, hierarchy and framework
• Functionality → basic and more advanced features are available in a comprehensive,
  yet "non-threatening" fashion

Important considerations when designing sensors and equipment

• Usability and reliability
• Producibility and maintainablity
• Safety and regulatory compliancy
• Environmental aspects and life cycle analysis
• Cost price and marketing