English to Russian Other Law: Contract(s)

Unless otherwise agreed in writing, the Consultant’s fees will be based on the number and seniority of staff required, the degree of skill and responsibility involved, the resources required to complete the engagement and the fee rates for the appropriate personnel. The Consultant’s fee rates will be reviewed from time to time under the mutual agreement of Parties. В данном контексте, мне кажется, что речь идет не трудовом стаже персонала, а о том, сколько задействовано руководителей. Или я ошибаюсь?