Take the occasional tendency to mock some posters' poor English. If enough people respond they find this attitude unacceptable, some of us might stop to think: 'Hang on, English may be this person's 2nd or 3rd language; is it such a clever idea to heap scorn on their attempt to communicate?'
Or take the way that occasionally, we name a community member and say: 'Person X should be stopped from continually posting nonsense' - which usually quickly degenerates into a flame war.
Yes, comments about lack of prowess with grammar or spelling, even for someone writing in their primary language, are usually cheap shots (once in a while it is pertinent). And carping out of the blue specifically at someone who has not previously been involved in the thread is hitting below the belt.
On the other hand, if two or more parties have been enjoying and consensually participating in an ongoing forum battle with one another, I see nothing wrong with one of them pointing out that the other is a twit, or the second person observing that the faulty logic of the first might best be explained as the result of questionable parentage and five or six generations of inbreeding.
2. Multiple answers for any questions could be considered with a grading system by having a choice to rate from 1 to 5 with 5 questions, etc.
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SurveyBob is fairly limited in the features it offers.
Let's give it a try! At best we can succeed, at worst we can try again!
Conducting a survey without the benefit of a tool to process the responses is neither terribly appealing to potential respondents - nor to the researcher. Before designing a survey, it would be advisable to select a tool, and then work within the parameters it supports.