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First Author:
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| Wafa Snoussi |
| Hihg institute of management tunisia ISG Tunis |
| wafa_snoussi@yahoo.fr |
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| wafa_snoussi@yahoo.fr |
| , Tunisia |
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| +216.97.981.575(Phone) |
| +216.97.981.575(Fax) |
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Second Author:
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| Mhamed ali El-aroui |
| university of management Nabeul |
| mhamed.elaroui@yahoo.com |
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