WHO IS BETTER AMONG NATIVE AND NON-NATIVE SPEAKER

According to me we can’t just say one is better than other. But if we talk about non native speaker they have gone through very hard period to get up to the level of native speaker. They have struggled a lot to learn the language. On the other hand if we talk about native speaker they don’t need any formal training as non natives do. People would like to be taught by native speakers, but that when it comes to qualification they would choose the better qualified teacher. So nationality of a person is not important.

http://www.teachingenglish.org.uk/forum-topic/native-vs-non-native-speakers-studying-abroad

BASIC ENGLISH TIPS

This video focuses on some grammatical tips for non-native speaker

SOME MORE GUIDELINES

If you are having problems with verbal communication, try drawing an object on paper. If you have failed with a sentence. Try again with a new, simpler sentence free of complex language.

There is a hint to not using big words. Speak a little slower than normal. It takes more time to parse a foreign language. Make many more gestures. Often it's possible to understand just by catching a couple of words and seeing the gestures.

Get used to not understanding everything. Take guesses at what someone said in another language, unless it's important that you understand the details. People who are translating between languages in their head often require a bit more time to invent a response. 

you can get more tips on

http://www.wikihow.com/Communicate-with-a-Non-Native-English-Speaker

PRINCIPLES FOR MORE EFFECTIVE COMMUNICATION FOR NON NATIVE SPEAKERS

Clarity is more important than accent

Non-native English speakers think that in order to be better understood, they need to lose their accent and adopt the accent of the native English speakers around them. This is unnecessary. What is really important is that we speak with clarity so that the listeners understand every word we say. so we engage in clear and effective communication using proper pronunciation techniques without having to resort to artificial accents. Keep in mind that your pronunciation does not have to be exactly the same as that of native speakers, as long as it is clear and easy to understand.

The Music of Language

The Key to Pronunciation and Accent Reduction. “The trick to speaking English with clarity and impact understands the melody and rhythm that is specific to English, but differs in other languages.

Pronunciation Principles

The three main components of pronunciation are sounds, word stress, and intonation.

Sounds

Pronunciation refers to the way you produce individual sounds and combinations of sounds. If you are a non-native English speaker, the way you tend to sound out some consonants and vowels may be different from the way Standard English sounds are pronounced.

Word Stress

The most common error that non-native English speakers commit is to put the emphasis on the wrong syllables or on the wrong words. The syllable that is stressed is said to carry the primary stress. If the word stress pattern is changed, many native English speakers will not understand what is being said. To further complicate matters for non-native speakers of English, the primary stress can change between words derived from the same base.

Intonation

Variation in pitch when speaking is called intonation. Whether the voice rises or falls or remains flat depends upon the meaning, and especially the feeling the speaker wants to convey. For example, there are specific intonation patterns for expressing surprise, boredom, irony, delight, and sadness.

you can view this at

http://www.speedspeak.com/index.php?option=com_content&task=view&id=76&Itemid=51

HOW TO APPROACH NON NATIVE SPEAKERS

Most instructors meet non-native speakers of English in their classes. Although native speakers of English also have problems with writing but the problems of non-native speakers' can be quite different, and the approach taken by the instructor needs to be different as well. Some services are available on campus to help non-native speakers, but the majority of the improvement will need to come from explanation made by the instructor. Although values must remain the same for native and non-native speakers, the instructor may need to change the approach of teaching for the non-native speaker.


 Generally, instructors find non-native speakers' papers overwhelming because there are several issues that need to be addressed. It is sometimes difficult to determine if the student is simply a weak writer. Most teachers say that they take the following approaches with their students.

In class write more on the board, it will help non native speaker to understand better and will strengthen what has been discussed in class. 

Make sure the assignments sheet gives a direction guideline. non native speakers depend on printed materials rather then listening.

Try to focus more on the content rather then grammar at first, so you can determine what else need to be work on.

http://writing.umn.edu/tww/responding/non-native.html

HOW NATIVE AND NON-NATIVE SPEAKERS ARE UNLIKE

Non native speakers are better skilled than native language speakers. 
As non native speakers have struggled a lot to learn the language where as native speakers are suitable English speakers but they don’t hold any formal teaching education for this.
Non native speakers are also aware of many techniques of learning to speak which is not the case with the native speakers. But the only area where they may face problem is pronunciation, which is not a difficulty in the case of natives. 
Even if the pronunciation is improved even then it cannot be a native one. 
The way of expressing ideas is so different and sometimes the gesture is used give a big different meaning in both the cases. Experience also matters a lot in this case because if the non native speakers have worked hard to learn the native language then that person can be way better then native regular speakers.

http://www.englishbaby.com/forum/AskEnglish/thread/434175

http://busyteacher.org/4570-esl-controversy-native-speaker-vs-non-native.html

BAD INFLUENCE OF NON NATIVE SPEAKERS AT WORK PLACE

Non-native speech is harder to understand than a native speech so they are less preferred to listen. Two problems arises for non native speakers for their accent, one is the accent serves as the signal and the other is that accent makes the speech harder to process. When the foreign accent acts as a signal, it is prejudice. Accent is one main cause that everyone proposes that people believe non-native speakers less simply because they are harder to understand.