James wrote a nice post about this subject. It is seductively easy to simplify the concept to just be equivalent to the design process, you know...SD, DD, CD. While you get a quick acknowledgement, "Oh I see...", it doesn't really explain the intentions of the phrase (acronym LOD). In his post he offers these reference descriptions. He also wrote that he is searching for another description for LOD100.
LOD100 = Interpolated calculations (estimates)
LOD200 = Specify it
LOD300 = Buy it
LOD400 = Build or install it
LOD500 = Operate or maintain it
The first thing that came to mind (based on the list) for LOD100 is "Discuss it".
Check out his post and weigh in.