Tereza then goes on to argue that too much praise can be counter-productive. She writes:
"I have already lost the sense of what is meant honestly [...]. I basically have no measure whether I did well or bad because I always get a perfect evaluation. You have no idea whether people like you or how high they think of you because they always say you did a fantastic job. At the beginning, it makes you feel good, like you are really special, you do really so well. But with time, you get tired of that because you already see through it".

"If they are not going to get praise and encouragement from the teacher at every step along the way, from where are they going to receive it?"I was taken by both articles, because they persuasively argue their points. They were also very thought-provoking and they led me to reflect on my own teaching practice a bit.
I think both Tereza and Lawrence are right. Giving feedback is much more complicated than we might initially think, and there are good lessons to be learned from both articles.
It is definitely true that giving too much praise can be counter-productive. Students will very quickly see through it. They know they didn't put much effort into their homework, but the teacher still was "super impressed". This can lead to one of two things:
- I don't need to work hard to get good grades/positive feedback, so why bother making more effort?
- Maybe my teacher is right and I'm simply the best, so why bother making more effort?

As Lawrence, points out, though, if we don't praise our students, who is going to? We do need to encourage them:
"Foreign language students have to overcome their own feelings of insecurity, lack of confidence, feelings of shyness and fear of making mistakes. [...] A teacher has to instill the confidence and how can one do that without complimenting and praising the efforts that we are witness to in class?"I agree with Lawrence that there are times when excessive praise (if given sparingly and judiciously, though) can work miracles. Sometimes you meet students who are terribly shy, lacking in confidence and their own abilities to the point of "I will never succeed" attitude. As a teacher, we need to encourage them to become more (but not too) self-confident. And a good way of doing it is by giving them slightly more positive feedback than they deserve.
However, we need to stop somewhere. We can't continue praising if there's nothing to praise for. But when and how?
In my opinion, we should be honest with our learners. We need to give praise when praise is due, but moderate it according to the student's performance. Students need to know what they did right, and what went wrong. Otherwise, if they only hear positive feedback, they won't know what to do to improve and do better next time. And if whatever our students do is fantastic and brilliant, we will be in a serious need of inventing even "more impressive" adjectives to praise them.
I also believe that the majority of students are far more robust than we think. Telling them they're wrong, or that they've made a mistake, is unlikely to cause tears or depression. Of course, the under-confident ones should be spotted and encouraged with highlighting positive feedback first. But if a student fails to do a task or make a mistake, we do need to tell them. How we do it, is a different kettle of fish and a good subject for a new post (here you can read my post on correcting students' writing). It goes without saying, though, that students expect us to point out their errors and help them improve.
An important consideration is also to respond to the content, rather than just the language. All too often, we focus on correcting errors and fail to notice the story the student has just shared with us. take a look at an example of feedback I recently gave to my 1-1 IELTS student on a recording he sent me. The student has struggled with fluency, is quite daunted by the speaking part and lacks a bit in confidence. We've been having classes for 3 weeks, twice a week 90mins:
"A very good effort, Ery! I used to do a lot of swimming myself. Really good exercise :) I might get back to it some time soon.
You structured your speech very well. You used good fillers to avoid pauses. You used some more complex sentences and there were a lot of error-free sentences. A good summary at the end as well. Keep up the good work and do more speaking, please. You've been improving, and it would be great if you could send me a recording like this at least every 2 or 3 days (it can even be more spontaneous if you don't have time to rehearse.
Some suggestions:
- at the end of sentences the intonation should go down/fall to indicate the sentence is finished
BTW, we say go swimming, not *go for swimming. Really looking forward to more recordings from you!"
- try to use substitution to avoid repeating go swimming or swimming so often, i.e. I do it/this sport/activity, I practise it/this sport

On the other hand, I included some suggestions. I didn't use the word error or mistake, because they have a negative overtone, while "suggestions" or "to improve" are neutral. But I think it would be wrong to overlook the errors and say: I was super impressed. You're really fluent. You're English is fantastic; because this is simply not true, and both me and the student know it.
To sum up, the key is a balanced feedback. Praise should be given when it's due. And it should be adjusted to the student's performance. We can't be super impressed with everything all the time. It's just not fair to the student in question, and to others who might be much better. And we definitely need to let the students know how they can improve and what the mistakes are. Otherwise we risk creating over-confident learners whose English is too impressive to continue working on it.