please show me how to find the candinates classes, and how do I know which should not include. thx

Question 1 Given below is a description of a proposed accounting and record-keeping system for a group medical practice. The questions which follow relate to an object-oriented design for this system. You have been approached to design an automated accounting and record keeping system for a group medical practice. With the increasing activity in the practice due to the number of doctors and patients, and with the increasing requirements for record-keeping to satisfy government require- ments, it has been decided to replace the old card system by a computerised one. The practice consists of a number of doctors and a number of nurses. The nurses are there to assist the doctors in carrying out their duties. They are not assigned to any particular doctor but are available to any as re quired. The nurses also handle the front desk, the sending and receiving of accounts, and telephone enquiries To make an appointment, a patient normally telephones or visits the front desk and arranges a suitable time which is acceptable to the preferred doc- tor. On arrival, the patient will notify the front desk, which will ensure that the patient record is available for the doctor. The doctor examines the patient, records the symptoms and diagnosis in the medical record, and in dicates a fee on the appropriate form which is returned to the staff at the front desk on completion of the visit. The front desk records the fee in the patient's account. On leaving, the patient returns to the front desk for the account and either pays it on the spot, or defers payment. The practice encourages early payment by giving a discount if the account is paid within a week of the visit. If payment is not made within a month of the visit, a reminder notice needs to be sent to the patient or the patient's parent or guardian. The practice allows some patients, such as pensioners, the unemployed, or health card holders, to request bulk-biling under the special Medicare provisions. These patients submit their Medicare card and sign the appropriate form at the completion of their visit. These forms are bundled by the practice into groups of 50 and are sent to Medicare for direct payment. The patient records contain the patient's name, address, together with past medical history, allergies, past test results, specialists' reports, etc. The pa tient records are kept separate from the accounts but are cross-referenced with the accounts. The accounts indicate the patient's name, address and the details of the person who pays the account (e.g. parent or guardian) The accounts also record the date, type (i.e. bulk-billing, non bulk-billing etc.) and charge for each visit. The accounts need to be searchable by pa Question 1 Given below is a description of a proposed accounting and record-keeping system for a group medical practice. The questions which follow relate to an object-oriented design for this system. You have been approached to design an automated accounting and record keeping system for a group medical practice. With the increasing activity in the practice due to the number of doctors and patients, and with the increasing requirements for record-keeping to satisfy government require- ments, it has been decided to replace the old card system by a computerised one. The practice consists of a number of doctors and a number of nurses. The nurses are there to assist the doctors in carrying out their duties. They are not assigned to any particular doctor but are available to any as re quired. The nurses also handle the front desk, the sending and receiving of accounts, and telephone enquiries To make an appointment, a patient normally telephones or visits the front desk and arranges a suitable time which is acceptable to the preferred doc- tor. On arrival, the patient will notify the front desk, which will ensure that the patient record is available for the doctor. The doctor examines the patient, records the symptoms and diagnosis in the medical record, and in dicates a fee on the appropriate form which is returned to the staff at the front desk on completion of the visit. The front desk records the fee in the patient's account. On leaving, the patient returns to the front desk for the account and either pays it on the spot, or defers payment. The practice encourages early payment by giving a discount if the account is paid within a week of the visit. If payment is not made within a month of the visit, a reminder notice needs to be sent to the patient or the patient's parent or guardian. The practice allows some patients, such as pensioners, the unemployed, or health card holders, to request bulk-biling under the special Medicare provisions. These patients submit their Medicare card and sign the appropriate form at the completion of their visit. These forms are bundled by the practice into groups of 50 and are sent to Medicare for direct payment. The patient records contain the patient's name, address, together with past medical history, allergies, past test results, specialists' reports, etc. The pa tient records are kept separate from the accounts but are cross-referenced with the accounts. The accounts indicate the patient's name, address and the details of the person who pays the account (e.g. parent or guardian) The accounts also record the date, type (i.e. bulk-billing, non bulk-billing etc.) and charge for each visit. The accounts need to be searchable by pa