In my opinion, it is needed to modify one of the names of the planes (and its "orientation") one can select when making a sketch.

I think that instead of XY, XZ, YZ, the appropriate planes should be XY, YZ and ZX (in this order).

If

**i**,

**j**and

**k**are unit vector along X, Y and Z axes respectively, vector algebra tell us that the following vector multiplications hold:

**i x j = k**,

**j x k = i**and

**k x i = j**

One of the effects of selecting XZ plane instead of the ZX is that the extrusions of the sketches on the former plane "grow" to the negative direction of the Y axis (by the way,

**i x k = - j**). Of course it can solved by inverting the extrusion sense, but it has not to be this way.

Regards