Something else to consider is: How long will be required to learn to use a particular aid? Web sites are generally fairly easy, but software may require more time, particularly to learn the more advanced features.
Another thing that is sometimes forgotten when considering software and devices is: How much will it cost? Someone always has to pay the bill: the school, the teacher, the student, the parent. So, always keep that it mind. Will the cost be justified by the potential benefits?
Illustrations on a blog are always good to see, because they will sometimes make a device or software program far easier to understand in a short time. Clear, simple diagrams and photos, with labels when necessary, will sometimes save a lot of words - and a lot of time for the blogger and the reader.
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