Development of umbrella clauses in investment treaty arbitration

Conduct an analysis of the development of the umbrella clauses in" rel="nofollow">in" rel="nofollow">in" rel="nofollow">in bilateral in" rel="nofollow">in" rel="nofollow">in" rel="nofollow">investment treaties. explain" rel="nofollow">in" rel="nofollow">in" rel="nofollow">in what is an umbrella clause. how and when the concept appeared and how was it applied in" rel="nofollow">in" rel="nofollow">in" rel="nofollow">in practice and what's the future of the concept.