Incorporating Variability in Lean Manufacturing: A Fuzzy Value Stream Mapping Approach

Table 2

Data recorded for the value stream.

	Raw material inventory (days)	Cutting (s)	Buffer 1 (days)	Prefitting (s)	Buffer 2 (days)	Computer stitching (s)	Buffer 3 (days)	Manual stitching (s)	Buffer 4 (days)	Assembly (s)	Buffer 5 (days)
(1)	1.9	23	0.6	30	1.5	310	0.6	324	2.5	511	3.4
(2)	1.8	20	1.2	28	1.7	317	0.5	299	2.6	496	2
(3)	2.2	21	0.4	27	1.3	325	0.4	273	1.8	531	2.9
(4)	2	19	0.6	32	1.5	322	0.3	300	1.9	509	3
(5)	1.9	22	0.9	29	1.6	319	0.1	310	0.5	493	2.2
(6)	2.3	20	0.6	31	1.4	333	0.4	305	1.1	505	4
(7)	2.1	19	0.6	31	1.6	331	0.5	311	0.7	508	1.8
(8)	2.1	18	0.5	33	1.6	321	0.5	295	1.7	528	4.2
(9)	1.5	19	0.7	30	1.2	320	0.4	315	0.5	504	1.9
(10)	2	22	0.9	30	1.4	322	0.4	306	3.5	547	1.8
(11)	1.9	21	1.1	31	1.4	319	0.6	298	2.4	522	2.6
(12)	2.4	20	0.6	30	1.4	315	0.5	307	3	520	3.1
(13)	2	19	0.3	30	1.4	328	0.5	291	2.2	503	0.5
(14)	1.2	22	0.8	31	1.4	323	0.2	292	1.2	525	0.7
(15)	2	21	1	32	1.4	303	0	287	1.2	514	1.5
(16)	2.2	16	0.7	27	1.7	314	0.3	303	2.4	530	1.1
(17)	2.5	20	0.9	33	1.3	321	0.2	279	0.5	515	2.6
(18)	1.5	19	0.7	31	1.6	327	0.4	271	1.7	494	2
(19)	2.1	21	1.1	27	1.6	315	0.5	299	1.8	506	1.2
(20)	2.2	20	0.9	32	1.5	315	0.6	296	1	512	2
(21)	1.5	23	0.6	33	1.5	323	0.2	300	0.5	492	3.4
(22)	2.5	20	0.8	31	1.2	324	0.7	311	0.5	506	1.9
(23)	1.7	21	1	29	1.6	329	0.4	297	1.5	495	2.5
(24)	2	22	1	31	1.6	327	0.7	318	1.7	514	2.1
(25)	2.4	20	0.8	28	1.2	315	0.4	293	1.3	518	2.4
(26)	2.2	20	0.8	31	1.5	314	0.2	305	1.2	536	2.6
(27)	2.6	20	1.2	31	1.5	318	0.3	295	2.3	531	3.5
(28)	2.3	20	0.7	28	1.6	326	0.5	295	1.2	519	3
(29)	2	20	0.9	31	1.4	325	0.6	309	2.1	492	1.9
(30)	1.7	21	0.9	30	1.6	314	0.5	288	1.9	496	2.7
(31)	1.8	19	0.8	29	1.4	317	0.7	294	1.9	518	3.5
(32)	2.3	17	1	31	1.2	318	0.6	327	2.3	518	2.8
(33)	1.9	21	1	30	1.5	333	0.5	277	1.8	527	1.3
(34)	2.6	20	1	29	1.4	317	0.4	303	1.8	489	2
(35)	1.6	24	0.6	29	1.6	323	0.4	300	3.2	500	2.4
(36)	2.1	22	1.1	30	1.6	318	0.4	280	2	505	2.1
(37)	2.1	17	1.2	29	1.3	326	0.3	283	4.4	518	3.4
(38)	1.9	20	0.6	27	1.3	326	0.2	296	2.5	521	2.7
(39)	2	19	0.7	31	1.4	323	0.5	289	3.3	510	2.4
(40)	1.5	19	0.6	30	1.5	310	0.5	290	2.7	493	1.4
(41)	2	19	0.9	31	1.3	327	0.2	314	2.6	502	1.6
(42)	2.2	18	0.9	32	1.5	313	0.5	296	1.6	487	0.8
(43)	2	22	0.6	32	1.6	308	0.5	298	3	523	1.5
(44)	2.1	19	0.6	30	1.6	325	0.7	286	2.4	506	3
(45)	2.5	19	0.3	30	1.3	328	0.6	307	3.2	514	1.6
(46)	2.2	19	0.7	29	1.6	314	0.6	287	2.7	510	0.5
(47)	2	18	0.5	29	1.7	333	0.3	289	2	510	1.4
(48)	2	17	0.9	28	1.4	318	0.4	297	1.9	520	1.7
(49)	2	22	1.4	30	2.0	311	0.4	308	3.1	519	4.5
(50)	2.1	21	0.8	29	1.5	316	0.4	306	3.7	506	2.7
(51)	2	20	0.7	32	1.5	322	0.6	294	1	502	2
(52)	1.7	20	0.8	32	1.4	322	0.3	304	2.4	505	2.1
(53)	2.3	21	0.8	31	1.7	322	0.7	292	1.3	507	2.2
(54)	1.9	20	1	31	1.6	327	0.1	307	2.5	508	2.1
(55)	1.5	21	1	34	1.4	320	0.2	301	2.4	488	2.2
(56)	1.6	21	1	28	1.5	317	0.4	275	1.4	519	2.7
(57)	2	17	0.8	31	1.7	319	0.7	319	1.3	502	2.5
(58)	2.1	17	0.9	30	1.7	323	0.3	286	3	506	1.7
(59)	2	19	0.7	29	1.7	320	0.7	299	2.4	530	1.5
(60)	1.8	18	0.8	30	1.6	311	0.6	304	1.1	494	2.8
(61)	2.3	19	0.9	31	1.5	315	0.4	286	0.9	499	2.4
(62)	1.7	17	0.6	28	1.4	327	0.5	309	2.4	516	1.7
(63)	1.6	18	0.9	29	1.6	320	0.3	285	2.5	494	2.3
(64)	2.2	18	0.6	27	1.5	329	0.4	297	1.1	508	3.3
(65)	1.8	20	0.8	31	1.5	310	0.6	288	1.5	521	2.3
(66)	2.1	22	0.9	29	1.5	325	0.3	305	1.2	516	1.1
(67)	1.9	17	0.3	29	1.4	320	0.3	293	1.6	506	2.7
(68)	2.1	19	0.8	29	1.3	320	0.3	309	1.3	516	1.8
(69)	2	17	0.5	28	1.3	326	0.4	294	1.9	505	1.4
(70)	2	17	1.2	31	1.7	328	0.3	289	2.5	509	1
(71)	1.9	19	0.8	28	1.3	311	0.2	298	1.1	505	2.8
(72)	1.8	21	0.7	30	1.1	322	0.7	290	2.8	518	1.3
(73)	2.4	22	0.7	29	1.6	324	0.2	284	1.2	509	2.3
(74)	2.5	21	0.6	30	1.3	323	0.5	313	2.9	531	1.9
(75)	2.3	19	0.5	28	1.5	310	0.4	283	0.9	516	1.8
(76)	1.2	18	0.8	28	1.5	323	0.4	315	1.9	506	1.5
(77)	2.2	19	0.8	30	1.4	323	0.4	303	1.9	489	1.4
(78)	2	23	1.4	30	1.4	326	0.7	317	2.2	525	2
(79)	2.6	22	0.7	27	1.8	324	0.5	290	1.6	522	2.1
(80)	2.1	21	1.2	33	1.7	320	0.5	290	0.8	540	1.2
(81)	2	19	1	29	1.7	326	0.5	296	1.7	522	3.1
(82)	2.4	21	1	32	1.3	325	0.5	290	2.8	505	1.2
(83)	2	21	0.8	29	1.4	325	0.4	292	2.4	516	1.4
(84)	1.7	19	0.4	29	1.5	320	0.6	296	0.7	511	4.2
(85)	1.8	18	1.1	28	1.5	316	0.5	285	0.8	515	1.1
(86)	2	19	0.7	29	1.6	315	0.3	300	0.6	516	1.9
(87)	1.9	24	1.1	30	1.3	312	0.4	301	2.3	501	1.2
(88)	1.5	23	0.7	32	1.6	316	0.2	312	3	519	2.2
(89)	1.3	24	0.9	33	1.5	327	0.7	306	0.5	485	0.9
(90)	1.9	20	0.7	30	1.4	334	0.3	289	2.8	493	3.4
(91)	2	19	0.8	32	1.6	316	0.4	315	1.4	514	2.3
(92)	2.2	23	0.8	30	1.6	316	0.4	288	1.4	524	2.2
(93)	2.7	18	0.9	29	1.4	323	0.5	304	2.3	491	2.8
(94)	1.9	18	0.3	31	1.2	325	0.5	292	2.4	525	3.5
(95)	1.9	16	1	31	1.5	316	0.2	297	1.1	496	1.4
(96)	2	18	0.3	29	1.6	319	0.7	303	3.2	509	2.2
(97)	2.2	24	0.8	32	1.5	319	0	295	1.1	517	2.1
(98)	1.4	17	0.6	32	1.4	333	0.8	318	2.2	508	2.9
(99)	2.5	18	0.8	32	1.6	318	0	301	3.1	494	2.4
(100)	2.1	21	1	30	1.8	311	0.6	308	1.9	517	1.7
Mean	2.01	19.84	0.80	30.05	1.49	320.60	0.43	298.06	1.91	510.58	2.18