I can tell you something about my experience with Kenyan runners.
a) Young Kenyans, the most part of times, join in their village some strong runner, trying to use his same training. Of course, training for a top athlete is already something hard and with a strategy. Young runners join top athletes without any personal strategy. Their only goal is to try to stay with top runners till when is possible.
b) Due to what I told before, it's obvious that young runners already having a good background and big talent can use training of top seniores for some short period, becoming able to run very fast in short time. But, after this, if they don't use a personal strategy for building their base at high level, they destroy themselves in very short time. That's the reason because many athletes can run fast and after this can disappear the next season.
c) During the first 5-6 years of activity, all kenyans runners increase the volume of km, reaching a very high level (with exclusion of the specialists of 800m coming from sprint events). After this period, their "aerobic house" is finished, and they can look for improving quality of training, reducing a little the volume. For example, with Shaheen the weekly average (during winter) of volume was 140 in 2001, 170 in 2002, 200 in 2003, 180 in 2004, 150 in 2005, 140 this year. But, at the some time, his SINGLE long fast run raised from 15k at 3:15 pace in 2001 till the current 25k at 3:10 pace (once per week), with one session every 4 weeks of 37-39km so fast. Last year, one week after winning Golden Gala with 7:56 in July (4 weeks before World Championships in Helsinki) he ran 37 km in 2:02. This winter he ran 39 km in 2:07 giving 4:00 to marathon runners like Cheboiboch and Frederink Cherono. I use the same methodology with Dorcus Inzikuru, that this winter ran 2 hours once every week.
d) Nobody trains really 3 times per day. When this happens, the first training is a session of warm-up lasting about 40 min, at very slow pace, very early in the morning, having only the goal to prepare the body for the session of 10 o'clock, that normally is more tough (may be track or hills). Normally, long run (progressive or even fast) and fartlek are very early in the morning. When we go with top athletes, we prefer to extend one session (for example, running till 1 hour of full fartlek, like this : 3 times 5:00 fast rec. 2:00 easy (21:00) + 4 times 3:00 rec. 1:30 (18:00) + 5 times 2:00 rec. 1:00 (15:00) + 5 times 1:00 rec. 30.0 (7:00) for a total duration of 61:00). Every athlete can chose if wants to run very easy 30-40min in the afternoon or not.
f) Very few athletes use, on track, distances longer than 1000m. Personally, I think that this is the reason because specialists of 10000m are not good like Ethiopians. With my athletes (Nicholas Kemboi 26:30, Ahmed Hassan 26:38, John Korir and Mark Bett 26:52, Moses Mosop bronze medal in WCh last year) I use 3000m and 2000m on track too, but many times they are the only one preparing 10000m. The reason is that 10000m never are in some meeting, apart Bruxelles, so the most important runners prefer to train speed for 3000 and 5000m.
g) Regarding the system, Kenyans use a very simple way of training, with 2 track sessions per week, one long run on Monday, the most part one rest on Sunday, plus some difference due to different coaches. The Coach that had more influence was Brother Colm for Track, and dr. Rosa for Marathon. When I find some athlete coming to me, already they have correct idea about training. I try to give them something more (for example, hill circuits, or special workouts with barriers for steeple runners, or specific speed-endurance workouts for marathon), but already they have a good level of preparation. Naturally, the "Kenyan School" can bring the athletes till 90% of their ability. A good coach can bring who wants to follow a more modern system very close 100%, but expecially can teach them how they can last longer time in their career.