Questions below refer to the following statement.
You may wish to modify an employee's contract of employment as the nature of your business changes or you undergo changing economic circumstances, whichever it may be for you.
Please make sure you (1)............... yourself thoroughly with the details of the existing contracts before considering (2)............... modifications you want to make.
And discuss any changes with your employees, fully explaining the reasons for any planned change and take into (3)............... the influence of the modifications on them.
If an agreement isn't reached on changes, you'd better try to negotiate a new contract.