Table 2 Product and testing machine information

(a) Testing time (and interface quantity constraint) of products at various stages

 W1

A2T2R

5 (1)

10 (1)

A2T4R

3 (2)

3 (2)

 W2

B2T2R

2 (1)

4 (1)

B2T4R

3 (2)

3 (2)

(b) Available machines in workshops

 M1

S1

1

W1

1

W2

1

 M2

S1

2

W1

0

W2

2

 M3

S2

1

W1

2

W2

2

 M4

S2

2

W1

2

W2

4

(c) Distance between workshops

 W1

0.5

1

 W2

1

0.5