pls with extends and include relaionship

An interview system can be useful for assessing whether an applicant's qualifications, experience, skills and salary needs are compatible with the position and the organization. The interviewer can assess the applicant's general communication skills, clarify unclear items on the applicant's C.V, suggest the salary and ask questions. The applicant can upload his/her C.V, answer questions but he/she must login first. The managing director can review all C.Vs, hide any C.V, gives instructions to staff and manager