This Study was undertaken to delineate the relationship between numerical score and the amount of nursing hours required in the nursing process. Score was a numerical description of the patients functional nursing needs. Therefore this study focused on standard nursing hours required by patient's self-care status. This study observed the 62 patients and 15 R.N. in H. university hospital from Aug. 7, 1982 to Aug. 13, 1982. 1. For the first time, each head nurse assessed self-care status by Schoening's self-care score. Minimal care patient (self-care score: 23,24) was placed in Group I, intermediate care patient (self-care score: ll~22) was Group II, and special care score: 0~10) was Group III. 2. We observed and recorded the nursing care received from nurses according to patient's group. (8AM-4PM) 3. And, We observed and recorded the activities of nurses in order to determine standard nursing hours required. (8AM~4PM) 4. If we apply the content of paragraph 3 to paragraph 2, we will predict the number of patient that nurse can care during day time by self-care status. The following results were obtained: 1) Patieat's mean self-care score were Group 1 : 23.9 score Group 2 : 17.8 score Group 3 : 1.6 score 2) Nursipg hours required by patient's physical function (self-care status) status were Group 1 : 35 min. Group 2 : 47.5 min. Group 3 : 104. 6 min. 3) Nurse's nursing time and distribution required in nursing activities during day duty were A.D.L. : 84.3min. (17.56%) Functional nursing activities: 279.9min.(58.31%) Education & Emotional support: 11. 3min.(2.35%) Task unrelated patients : 54min.(11.25%) Non Productive nursing care : 50. 5min.(10. 52%) 4) Mean nursing hours required by each patient and the number of patient that nurse can care during day duty by self-care status were Group 1 : 38.6min. 11.1 patients/1 nurse Group 2 : 51. 1min. 8.4 patients/1 nurse Group 3 : 108.2min. 4 patients/1 nurse It seems reasonable that this could be done effectively as each-unit has an established standard for hours required. This not only allows time for planning of staff but helps to avoid the very human inelination to predict excessive staffing requirements by placing the majority of patients in high care group.