Motivation Letter For The Job Vacancy

I m an assistant HR in one of the organisation. Recently Swiss Agency for Development and Cooperation has floated a vacancy for the post of office manager. i am interested to apply for it. they have requested to attach CV with Motivation Letter. so, now i am in need of help from all the members as to what kind of Motivation letter would be relevant for them.
cring wangdi

Hello Cring,
I think you should ask them that clearly what they are requesting, so you may get an idea.