We discuss three common mechanisms for achieving coordination, with particular reference to the choice of compatibility standards. The first involves explicit communication and negotiation before irrevocable choices are made: it represents what standardization committees do. The second mechanism, by contrast, involves no explicit communication and depends on unilateral irrevocable choices: it succeeds if one agent chooses first and the other(s) follow(s). This is a simple version of ”market leadership.” We analyze these two mechanisms in a simple model and show that the committee is more likely to achieve coordination. Moreover, although the committee is slower, it outperforms the market mechanism, even when in which both communication and unilateral preemptive actions are allowed.