We started this meeting with a discussion of Vassily Yakovlevich Struve. I would like to mention again this great founder of the Pulkovo Observatory. Vassily Yakovlevich directed the determination of a constant of precession which is almost identical to the modern value determined by VLBI. How did he and his son Otto do that? They observed and reduced their own data, thereby avoiding the pitfalls of using data compiled by others without a full understanding of what went into such compilations. Can we still do this? I think this excellent symposium has taught us that, with difficulty, we can; that there are many who do not recognize the pitfalls; but that the reward is unprecedented accuracy and worldwide recognition.