An appointment letter is a bilateral agreement. You cannot unilaterally ask a candidate to abide your rules and regulations. On the other hand, you create an excellent work environment, create employee engagement, give proper career growth, identify performers, nurture them, find out what drives them to perform and develop their skills and competencies. If you do such things, no guy will leave the organisation. I started my career as Executive Secretary to one of the five board directors in 1978, with L&T in Delhi, after quitting Central Govt job (a permanent job) but retired from L&T after 31 years as Senior DGM and Head of HR, plus two years there as HR Consultant. Never once I thought of resigning and I am doing fantastic now, after retirement, travelling overseas for training and HR assignments, keeping me busy all the time for my soft skill / HR training work.