I try to make sentences and therefore the whole flow smoothly from start to finish. That means collating as much information as I can on a given subject, raiding the local library, writing away for information from large organisations, books from anywhere and everywhere. Then I read all this information, and translate it into something easily understood. Wrong' information must bother teachers, if they find it. When all this information is finally down on paper, the real work begins, that of scanning the manuscript for unintentional phrases which could cause offence to any ethnic group or religion.
Careful attention is given to names, and also the balance of whitel other races.
Equally important is the balance of sexes. One of my books had 3 boys and 2 girls as main characters. After discussion with my publishers, this was changed to 3 girls and 2 boys, so that the stronger characters reflected a good balance between boys and girls. And the artwork is always desigued to show a multi-racial mix. There are naturally times when all this is extremely frustrating and restrictive.