Other errors (i.e. unsolicited advice):

1) Change *we’ve* to *we have*. Otherwise, change *cannot* to *can’t*, *we are* to *we’re* and so on. Consistency is very important, especially considering you are only writing one paragraph.

2) “…because the respondent that should be targeted is the highly poor ones…” First you are using singular than plural and you used *is* to describe *highly poor ones*. Try: “the respondentS that should be targeted ARE the highly poor ones”

3) What do you mean your client is “generally an established SME”? It’s either established or not established.

Sorry to be seem like a know-it-all. Just want to help a brother in need.

Frankly speaking, there are a few more errors in the paragraph; check below:

‘We think the client, (comma) in the project that we’ve been handling, (comma) cannot be *used/interviewed* as a respondent for this survey, because/since/as the respondent(s) that should be targeted ‘are’ the highly/extremely poor ones, (comma) while the client in our project is generally an established SME, (comma) ‘who’ cannot be categorized as ‘highly/extremely’ poor. We are not sure that the use/application of this tool will help us get a ‘description (is that the correct word?)’ about poverty at ‘a’ micro enterprise level.’

I hope this helps.

Ciao.

‘ Cannot be a respondent’ is better english.

Mikie is right….it should be “cannot be a respondent” ….the word ‘used’ is unecessary….and this way it sound better.

ALL THE BEST !!!!