A compact practical day for cleanroom managers. Using typical examples, it will be shown how planning, construction, and organization influence cleanroom operation and which solutions have proven effective in practice. Topics of the day: How large should I plan a cleanroom door station? Which cleanroom class should I choose, or is a clean area sufficient? Which filter quality ensures my process? Design and construction of door stations Dressing and entry into the cleanroom Cleanroom clothing in the system Requirements for cleanroom floor coverings Maintenance and qualification Cleanroom cleaning: equipment, methods, and control Training in cleanroom behavior