An MRP exercise is being implemented over an 8-week period and the following relevant information is provided:

One unit of A is made of three units of B, one unit of C, and three units of D. B is composed of two units of E and one unit of D. C is made of one unit of B and two units of E. E is made of one unit of F.

Items B, C, E and F have one week lead times; A and D have lead times of two weeks. Assume that lot-for-lot (L4L) lot sizing is used for Items A, B and F; lots of size 50, 50 and 200 are used for Items C, D and E respectively. Items C, E and F have on-hand (beginning) inventories of 10, 50 and 150 respectively; all other items have zero beginning inventory. We are scheduled to receive 10 units of A in Week 2, 50 units of E in Week 1, and also 100 units of F in Week 1. There are no other scheduled receipts.

a) Draw the product structure with low-level coding

b) Draw the corresponding time-phased diagram showing lead times to scale.

c) If 30 units of A are required in Week 8, determine the necessary planned order releases for all components {6 schedules}