Two minor points I noticed in the survey:
Question 2 is "How long have you worked in the software development / IT industry", while in question 3 I get asked what industry I am in -- which isn't neccessarily SD/IT.
You can only choose one answer in Question 5 ("What is your role your company's purchasing process?"), although the answers are neither mutually exlusive nor accumulatively implying each other (I hope you know what I mean).
Update for you non-believers: