Which grammar you have written? Which language(s)? Rate your GF and language skills with the following scale:
Language skills
0 : no skills
1 : passive knowledge
2 : fluent non-native
3 : native speaker
GF skills
0 : no skills
1 : basic skills (2-day GF tutorial)
2 : medium skills (previous experience of similar task)
3 : advanced skills (resource grammar writer/substantial contributor)