For anyone who can make both kinds perfectly, the "steered" turn involves just as little effort as the "jerked," and I certainly advise the beginner to get thoroughly accustomed to starting his turns by "steering" before he learns to "jerk" them.
I have only given directions for making the "jerked" turn from a direct descent; "jerked" turns, either uphill or downhill, can of course be made from a traverse in just the same way. Downhill turns are always rather more difficult than uphill turns, whatever be the method of turning; downhill "jerked" turns have the added difficulty that if, as is generally the case, the angle between the two tacks is a small one, the skis have to be jerked round farther than would usually be necessary in an uphill turn, and the jerk therefore takes more effort.
In snow which allows you to make a complete jerked turn you can, if not running very fast, practically stop dead, or change your course instantaneously, by making the Christiania in this way, for the edging of the skis, after the turn has been made, stops the side-slip almost before it has had time to begin.
If, on hard snow, you make a Christiania (of any kind) sharply while travelling at a high speed, you will often find that, after you have come round, the side-slip, which will then be very great, will be too irregular to allow you to keep your balance without holding the skis at some distance apart. Even a good runner is sometimes compelled to separate his skis in this way, but you should not do it if you can possibly help it, and if compelled to, should always bring the skis together as the side-slip grows less, _not_ for the look of the thing, but because, though possible, it is difficult, if the skis are apart, to start a swing instantly in the other direction, as you may often wish to do.
The Christiania can also be started, as Bilgeri and his school advise, and as I have practically said already, from a very undeveloped ordinary stemming turn. In order, for instance, to make a swing to the left, one can advance the _right_ ski, push out its heel a little, throw the weight on it, and face towards its point, and can then, by instantly bringing the left ski parallel and to the front and weighting its heel as well as the other's, finish the turn as a Christiania. This is very easy to learn, and, if the preliminary stem is reduced to a minimum, is quite effective; but it is a much less steady way of turning at a very high speed than a Christiania started with the inside ski leading, and high speed is the real test.