(1)① It is necessary to know how many day students and teachers eat in the school cafeteria at noon, plus 2 boarding students, which is the largest number of people who will eat in the cafeteria next semester;

② We should also know the number of boarding students to be enrolled next year and the year after next, so as to get the number of students who will eat in the dining hall in the whole school after three years;

③ the floor space of each dining table and chair, the space left, the floor space when waiting in line to buy rice, and the floor space of the rice selling area;

④ Investigate the number of restaurant staff needed by restaurants of the same size.

(2) ① Count the number of students and teachers who have lunch at school through questionnaire survey;

② Ask the school leaders about the number of boarding students to be enrolled next year and the year after;

③ actual measurement and estimation, to determine the floor space of each dining table and chair, the space left, the floor space when waiting in line to buy rice, and the floor space of the rice selling area, so as to determine the use area of the restaurant;

④ Go to the school or catering industry where there is an existing restaurant to find out the number of restaurant staff needed for a restaurant of this size.