Appendix

Appendix 1

Combined Values Chart

The values are derived from the formula:

A + B(1-A) = combined value of A and B

where A and B are the decimal equivalents of the WPI ratings

In the chart all values are expressed as percentages. To combine any two impairment values, locate the larger of the values on the side of the chart and read along that row until you come to the column indicated by the smaller value at the bottom of the chart. At the intersection of the row and the column is the combined value.

For example, to combine 35% and 20%, read down the side of the chart until you come to the larger value, 35%. Then read across the 35% row until you come to the column indicated by 20% at the bottom of the chart. At the intersection of the row and column is the number 48. Therefore, 35% combined with 20% is 48%. Because of the construction of this chart, the larger impairment value must be identified at the side of the chart.

If three or more impairment values are to be combined, sort the impairment values from highest to lowest, select the highest and find their combined values as above. The use that combined value and the third highest impairment value to locate the combined value of all.

This process can be repeated indefinitely, the final value in each instance being the combination of all the previous values. In each step of this process the larger impairment value must be identified at the side of the chart.

Combined Values Chart
1	2
2	3	4
3	4	5	6
4	5	6	7	8
5	6	7	8	9	10
6	7	8	9	10	11	12
7	8	9	10	11	12	13	14
8	9	10	11	12	13	14	14	15
9	10	11	12	13	14	14	15	16	17
10	11	12	13	14	15	15	16	17	18	19
11	12	13	14	15	15	16	17	18	19	20	21
12	13	14	15	16	16	17	18	19	20	21	22	23
13	14	15	16	16	17	18	19	20	21	22	23	23	24
14	15	16	17	17	18	19	20	21	22	23	23	24	25	26
15	16	17	18	18	19	20	21	22	23	24	24	25	26	27	28
16	17	18	19	19	20	21	22	23	24	24	25	26	27	28	29	29
17	18	19	19	20	21	22	23	24	24	25	26	27	28	29	29	30	31
18	19	20	20	21	22	23	24	25	25	26	27	28	29	29	30	31	32	33
19	20	21	21	22	23	24	25	25	26	27	28	29	30	30	31	32	33	34	34
20	21	22	22	23	24	25	26	26	27	28	29	30	30	31	32	33	34	34	35	36
21	22	23	23	24	25	26	27	27	28	29	30	30	31	32	33	34	34	35	36	37	38
22	23	24	24	25	26	27	27	28	29	30	31	31	32	33	34	34	35	36	37	38	38	39
23	24	25	25	26	27	28	28	29	30	31	31	32	33	34	35	35	36	37	38	38	39	40	41
24	25	26	26	27	28	29	29	30	31	32	32	33	34	35	35	36	37	38	38	39	40	41	41	42
25	26	27	27	28	29	30	30	31	32	33	33	34	35	36	36	37	38	39	39	40	41	42	42	43	44
26	27	27	28	29	30	30	31	32	33	33	34	35	36	36	37	38	39	39	40	41	42	42	43	44	45	45
27	28	28	29	30	31	31	32	33	34	34	35	36	36	37	38	39	39	40	41	42	42	43	44	45	45	46	47
28	29	29	30	31	32	32	33	34	34	35	36	37	37	38	39	40	40	41	42	42	43	44	45	45	46	47	47	48
29	30	30	31	32	33	33	34	35	35	36	37	38	38	39	40	40	41	42	42	43	44	45	45	46	47	47	48	49	50
30	31	31	32	33	34	34	35	36	36	37	38	38	39	40	41	41	42	43	43	44	45	45	46	47	48	48	49	50	50	51
31	32	32	33	34	34	35	36	37	37	38	39	39	40	41	41	42	43	43	44	45	45	46	47	48	48	49	50	50	51	52	52
32	33	33	34	35	35	36	37	37	38	39	39	40	41	42	42	43	44	44	45	46	46	47	48	48	49	50	50	51	52	52	53	54
33	34	34	35	36	36	37	38	38	39	40	40	41	42	42	43	44	44	45	46	46	47	48	48	49	50	50	51	52	52	53	54	54	55
34	35	35	36	37	37	38	39	39	40	41	41	42	43	43	44	45	45	46	47	47	48	49	49	50	51	51	52	52	53	54	54	55	56	56
35	36	36	37	38	38	39	40	40	41	42	42	43	43	44	45	45	46	47	47	48	49	49	50	51	51	52	53	53	54	55	55	56	56	57	58
36	37	37	38	39	39	40	40	41	42	42	43	44	44	45	46	46	47	48	48	49	49	50	51	51	52	53	53	54	55	55	56	56	57	58	58	59
37	38	38	39	40	40	41	41	42	43	43	44	45	45	46	46	47	48	48	49	50	50	51	51	52	53	53	54	55	55	56	57	57	58	58	59	60	60
38	39	39	40	40	41	42	42	43	44	44	45	45	46	47	47	48	49	49	50	50	51	52	52	53	54	54	55	55	56	57	57	58	58	59	60	60	61	62
39	40	40	41	41	42	43	43	44	44	45	46	46	47	48	48	49	49	50	51	51	52	52	53	54	54	55	55	56	57	57	58	59	59	60	60	61	62	62	63
40	41	41	42	42	43	44	44	45	45	46	47	47	48	48	49	50	50	51	51	52	53	53	54	54	55	56	56	57	57	58	59	59	60	60	61	62	62	63	63	64
41	42	42	43	43	44	45	45	46	46	47	47	48	49	49	50	50	51	52	52	53	53	54	55	55	56	56	57	58	58	59	59	60	60	61	62	62	63	63	64	65	65
42	43	43	44	44	45	45	46	47	47	48	48	49	50	50	51	51	52	52	53	54	54	55	55	56	57	57	58	58	59	59	60	61	61	62	62	63	63	64	65	65	66	66
43	44	44	45	45	46	46	47	48	48	49	49	50	50	51	52	52	53	53	54	54	55	56	56	57	57	58	58	59	60	60	61	61	62	62	63	64	64	65	65	66	66	67	68
44	45	45	46	46	47	47	48	48	49	50	50	51	51	52	52	53	54	54	55	55	56	56	57	57	58	59	59	60	60	61	61	62	62	63	64	64	65	65	66	66	67	68	68	69
45	46	46	47	47	48	48	49	49	50	51	51	52	52	53	53	54	54	55	55	56	57	57	58	58	59	59	60	60	61	62	62	63	63	64	64	65	65	66	66	67	68	68	69	69	70
46	47	47	48	48	49	49	50	50	51	51	52	52	53	54	54	55	55	56	56	57	57	58	58	59	60	60	61	61	62	62	63	63	64	64	65	65	66	67	67	68	68	69	69	70	70	71
47	48	48	49	49	50	50	51	51	52	52	53	53	54	54	55	55	56	57	57	58	58	59	59	60	60	61	61	62	62	63	63	64	64	65	66	66	67	67	68	68	69	69	70	70	71	71	72
48	49	49	50	50	51	51	52	52	53	53	54	54	55	55	56	56	57	57	58	58	59	59	60	60	61	62	62	63	63	64	64	65	65	66	66	67	67	68	68	69	69	70	70	71	71	72	72	73
49	50	50	51	51	52	52	53	53	54	54	55	55	56	56	57	57	58	58	59	59	60	60	61	61	62	62	63	63	64	64	65	65	66	66	67	67	68	68	69	69	70	70	71	71	72	72	73	73	74
50	51	51	52	52	53	53	54	54	55	55	56	56	57	57	58	58	59	59	60	60	61	61	62	62	63	63	64	64	65	65	66	66	67	67	68	68	69	69	70	70	71	71	72	72	73	73	74	74	75	75
51	51	52	52	53	53	54	54	55	55	56	56	57	57	58	58	59	59	60	60	61	61	62	62	63	63	64	64	74	65	66	66	67	67	68	68	69	69	70	70	71	71	72	72	73	73	74	74	75	75	76	76
52	52	53	53	54	54	55	55	56	56	57	57	58	58	59	59	60	60	61	61	62	62	63	63	64	64	64	65	65	66	66	67	67	68	68	69	69	70	70	71	71	72	72	73	73	74	74	75	75	76	76	76	77
53	53	54	54	55	55	56	56	57	57	58	58	59	59	60	60	61	61	61	62	62	63	63	64	64	65	65	66	66	67	67	68	68	69	69	69	70	70	71	71	72	72	73	73	74	74	75	75	76	76	77	77	77	78
54	54	55	55	56	56	57	57	58	58	59	59	60	60	60	61	61	62	62	63	63	64	64	65	65	66	66	66	67	67	68	68	69	69	70	70	71	71	71	72	72	73	73	74	74	75	75	76	76	77	77	77	78	78	79
55	55	56	56	57	57	58	58	59	59	60	60	60	61	61	62	62	63	63	64	64	64	65	65	66	66	67	67	68	68	69	69	69	70	70	71	71	72	72	73	73	73	74	74	75	75	76	76	77	77	78	78	78	79	79	80
56	56	57	57	58	58	59	59	60	60	60	61	61	62	62	63	63	63	64	64	65	65	66	66	67	67	67	68	68	69	69	70	70	71	71	71	72	72	73	73	74	74	74	75	75	76	76	77	77	78	78	78	79	79	80	80	81
57	57	58	58	59	59	60	60	60	61	61	62	62	63	63	63	64	64	65	65	66	66	66	67	67	68	68	69	69	69	70	70	71	71	72	72	72	73	73	74	74	75	75	75	76	76	77	77	78	78	79	79	79	80	80	81	81	82
58	58	59	59	60	60	61	61	61	62	62	63	63	63	64	64	65	65	66	66	66	67	67	68	68	69	69	69	70	70	71	71	71	72	72	73	73	74	74	74	75	75	76	76	76	77	77	78	78	79	79	79	80	80	81	81	82	82	82
59	59	60	60	61	61	61	62	62	63	63	64	64	64	65	65	66	66	66	67	67	68	68	68	69	69	70	70	70	71	71	72	72	73	73	73	74	74	75	75	75	76	76	77	77	77	78	78	79	79	80	80	80	81	81	82	82	82	83	83
60	60	61	61	62	62	62	63	63	64	64	64	65	65	66	66	66	67	67	68	68	68	69	69	70	70	70	71	71	72	72	72	73	73	74	74	74	75	75	76	76	76	77	77	78	78	78	79	79	80	80	80	81	81	82	82	82	83	83	84	84
61	61	62	62	63	63	63	64	64	65	65	65	66	66	66	67	67	68	68	68	69	69	70	70	70	71	71	72	72	72	73	73	73	74	74	75	75	75	76	76	77	77	77	78	78	79	79	79	80	80	81	81	81	82	82	82	83	83	84	84	84	85
62	62	63	63	64	64	64	65	65	65	66	66	67	67	67	68	68	68	69	69	70	70	70	71	71	72	72	72	73	73	73	74	74	75	75	75	76	76	76	77	77	78	78	78	79	79	79	80	80	81	81	81	82	82	83	83	83	84	84	84	85	85	86
63	63	64	64	64	65	65	66	66	66	67	67	67	68	68	69	69	69	70	70	70	71	71	72	72	72	73	73	73	74	74	74	75	75	76	76	76	77	77	77	78	78	79	79	79	80	80	80	81	81	82	82	82	83	83	83	84	84	84	85	85	86	86	86
64	64	65	65	65	66	66	67	67	67	68	68	68	69	69	69	70	70	70	71	71	72	72	72	73	73	73	74	74	74	75	75	76	76	76	77	77	77	78	78	78	79	79	79	80	80	81	81	81	82	82	82	83	83	83	84	84	85	85	85	86	86	86	87	87
65	65	66	66	66	67	67	67	68	68	69	69	69	70	70	70	71	71	71	72	72	72	73	73	73	74	74	74	75	75	76	76	76	77	77	77	78	78	78	79	79	79	80	80	80	81	81	81	82	82	83	83	83	84	84	84	85	85	85	86	86	86	87	87	87	88
66	66	67	67	67	68	68	68	69	69	69	70	70	70	71	71	71	72	72	72	73	73	73	74	74	75	75	75	76	76	76	77	77	77	78	78	78	79	79	79	80	80	80	81	81	81	82	82	82	83	83	83	84	84	84	85	85	85	86	86	86	87	87	87	88	88	88
67	67	68	68	68	69	69	69	70	70	70	71	71	71	72	72	72	73	73	73	74	74	74	75	75	75	76	76	76	77	77	77	78	78	78	79	79	79	80	80	80	81	81	81	82	82	82	83	83	83	84	84	84	84	85	85	85	86	86	86	87	87	87	88	88	88	89	89
68	68	69	69	69	70	70	70	71	71	71	72	72	72	72	73	73	73	74	74	74	75	75	75	76	76	76	77	77	77	78	78	78	79	79	79	80	80	80	80	81	81	81	82	82	82	83	83	83	84	84	84	85	85	85	86	86	86	87	87	87	88	88	88	88	89	89	89	90
69	69	70	70	70	71	71	71	71	72	72	72	73	73	73	74	74	74	75	75