There are boutiques that are considered Tier 1 within the MC industry although not well known outside the industry (e.g., Monitor, AlixPartners). There are firms that are Tier 1 in certain countries but not in others (e.g., Roland Berger, LEK). There are firms that are on the cusp...and would be considered Tier 1 depending on who you ask (Booz, Mercer). There are really only 3 firms that are universally considered Tier 1 -- McKinsey, Bain, and BCG. As someone alluded to earlier, Booz have lost a lot of their lustre because: (1) they have a huge government practice that doesn't necessarily attract the best and the brightest; (2) they've become known for their "politically-charged" environment, and (3) because they handled the 2001 lay-offs particularly and spectacularly bad, so a few top-tier MBAs have intentionally steered away from them. And in the world of top tier MC, you are who you hire, and you are where you recruit from.Of the 3 universally-accepted Tier 1s, only one is a "pure play" strat house -- BCG. McK and Bain (contrary to popular belief) have large Operations practices...which do quite "mundane" things like Manufacturing and Supply Chain (strategic sourcing, logistics, etc.). Monitor (the boutique I mentioned earlier) is also a "pure play" strat firm. AlixPartners specializes in turning around companies that are near or in bankruptcy. Because all top tier firms practice some level or "up-or-out" (look for a long thread around this topic), this means 90% of all Analysts and Associates at Tier 1 firms never make it to Partner. Therefore, from my perpspective, a true test of a firm's "eliteness" is where their alumni land when they get "out-counseled". You guys can do your own research on this one.