Hi Chaoyi, In blueprint you described for PoC, there are information of tables. [1] They seem to out-to-date. Do you think that those information need to be up-to-date in your blueprint? If it's not necessary, it's better to move those information to different sheet or put some comment like "Won't be updated", I think. [1] https://docs.google.com/document/d/18kZZ1snMOCD9IQvUKI5NVDzSASpw-QKj7l2zNqMEd3g Cheers, Shinobu -- Email: shinobu at linux.com GitHub: shinobu-x Blog: Life with Distributed Computational System based on OpenSource