If you need convincing about the importance of offering clear communication, take a look at the Plain English Campaign website.
We love the examples of how English can go horribly wrong….take a look here.
Our particular favourite is this example of ‘before’ and ‘after’ editing for plain English:
If there are any points on which you require explanation or further particulars we shall be glad to furnish such additional details as may be required by telephone.
If you have any questions, please phone.