How companies take advantage of value chain activities in building strategic alliances?

How companies take advantage of value chain activities in building strategic alliances? What this process adds to developing competitive advantage? What partners in the best strategic alliances have to offer?

2. Why the choice of partner is important in forming strategic alliances? How this choice affects the stability of alliance building, lead to common goals and benefits partners?

3. How joint venture cooperative agreements are different from other alliance buildings? What are the benefits and pitfalls in these kinds of alliances?