I want to know how to write a letter of responsibility to an employee.

I want to know how to write the letter of responsibility stating the taks and deadlines involved.Outlining the duties and monitoring progress.

Responsible for what ?

In most if not all business matters it is best to merely state the exact facts as you want them.

So state exactly here what is the terms and responibility and duties of each party.

That would be the outline of the letter