All ofthe samples were taken along three parallel, horizontal drifts.

Acorrection term was added to the kriging variance to account for the changein support.

Also, some of the samples in v might be within V.

When this occurs, it is tempting for the teacherto say the student is not attentive or lazy; however, the pervasivenessof the phenomenon, even with successful students, argues against anysuch explanation.

Therefore, a semi-variogram calculatedfrom the sample supports

Numerous studies have revealed that grammar correction to secondlanguage writing students is actually discouraging to many students,and even harmful to their writing ability (Semke 1984; Kepner 1991;Sheppard 1992; and Truscott 1996).

Moreover, the time spent by students andteachers on correcting grammatical errors causes needed attention to besidetracked from other important elements of writing, like organizationand logical development of content.
The first reason why writing class grammar feedback doesn't work isthat it treats only the surface appearance of grammar and not with theway language develops (see Truscott 1996 for details).

Each of the 3,786 samples consisted of a grade and vein thickness.

Moreover, making full (every error iscorrected by the teacher) or selective (only one type of error ismarked at a time) grammatical corrections is also not effective.

The vast majority of the samples were channel samples.

Finally, students generally only make a mentalnote of the corrections they have understood, and if they have torewrite their papers, regularly do
not incorporate these corrections into their work (Cohen 1987).
So what should a L2 writing teacher do?

A sample coordinate was assigned at the middleof each interval.

This would of course be difficult for teachers to dobecause it has been shown most students strongly expect teachers tonotice their writing errors and comment on them, and they become quiteresentful if this does not occur.

The sample spacings were commonto both variables.

Adding to this pressure to givegrammar feedback is the fact that established curriculum of manylanguage school and university writing programs (especially overseas)is based on the value of grammar correction and if a teacher did notemploy it, they would have a good chance of being consideredunprofessional.

One possible solution to this problem which I have found to be usefulis to give periodic short grammatical lessons at the beginning of class(the week after a big homework assignment), and I discuss one or twowidespread grammatical problem (e.g.

Every block is considered in the same manner.

Consequently, the authors concluded thatcomprehensive treatment and overt corrections of surface errors areprobably not worth the trouble for teachers to make.

Additional studies have shown that neither the use of direct orindirect techniques in correcting student errors has an influence onwriting ability results.

The average grade begins increasing at the samepoint.

Krashen (2004b) recommends teachers simply informtheir students of the limitations of grammar correction but I havedoubts whether students would be satisfied with such an explanation.

But just because grammar feedback is problematic does not mean allfeedback is ineffective.