Out-of-Sequence Work

I have an issue concerning out-of-sequence work. The industry is construction, but information from any industry might be helpful.

1. What is the typical amount of out of sequence activities that you would see?

2. Are there any publications that support what is acceptable?

3. Could I support that 10-15% is acceptable?

Granted, reasons for out-of-sequence work vary. Does anyone know of any source that deals with this topic?

Thanks,
Todd