1. around 300 words,
2. theme is about solutions to solve the problems in pcb designing or PCB assembly, it should list the common problems in pcb design OR PCB Assembly, and measures to solve or avoid them
3, each article should include 3 pictures to better explain the subject
pictures should not be download from web, should be your own PCB layout picture or other pcb picture, it can be just a screenshot which helps explain what you want to say
4. it should have a proper title.
5. 100% pass copyscape. http://copyscape.com/