How do you design your maps?

[Alien]

1. Idea (based on gameplay or theme or style)
2. Name of map
3. Layout (paper for coop or in single in head), then create basic layout without textures and details, you have created the whole map after this step something as nooby map
4. you start to create detailed parts,
4a. Putting to each part of map some idea to get it easer for learning and create diversity
4b. Combine mapmodels with textures and layout of detail
4c. Try to modify your idea to overall style of map.
4d. Put lights and all mapmodels
4e. Restart map and go to look how this part looks by eyes of player.
4f. if you like it go to other part
(don't copy ideas from other maps, do something original in your map, use /copy and paste for get effect of regularity, try to have proper diversity and the same style and theme everywhere etc.)
5. /clearents light and create all lights again
6. go through map and fix mapmodels, put ladders and clips
7. put player entities and pickups
8. test gameplay with friends
9. upload your map everywhere you can, force all around to test it, advertise, lobby and force lazy players to learn your map.