A primary reason for lack of effective communication is that, without realizing it, people typically inject communication barriers into their conversation. Communication barriers are high risk responses,  these are responses that frequently impact communications negatively.

In order to avoid these common roadblocks, it is very worthwhile working through them,  understanding what they are and considering when you might have either instigated these  roadblocks or been on the receiving end of them. This will make you far more aware of them  and able to avoid them in your work and day to day life. You will get the most out of this if you  can be completely honest with yourself. Each of these can destroy or erode trust with others.  Take your time with this and refer to it every day over a period of weeks, you will enhance  your communication immeasurably.