The hotel and tourism industry is changing worldwide and is experiencing stormy times right now. On the one hand, we are dealing with the coronavirus pandemic, on the other hand with the wave of digitalisation and changes in tourists' and guests' wishes. We have taken on these major challenges and present you with sustainable and environmentally friendly quality standards for hotels and restaurants. We have divided the quality standards into three reference books to make them more handy. The first part contains quality standards for the management, the second part contains quality standards for the hotel area and the third part contains quality standards for the restaurant area. Our quality standards are field-tested and TÜV-approved.