I am using a case study to create a class diagram and a sequence diagram but am becoming a bit unstuck...
The case study is as follows;
Liverpool chemicals makes a range of intermediate ingredients for household and other chemical goods. Examples are perfumes, fixers and colours. These are manufactured at 2 plants. One in Liverpool, one in St Helens.
After manufacture goods are placed into barrels (square ones). They are then moved to a distribution warehouse operated by a third party logistics company and is referred to as Leyland Depot. All goods leave the factory site upon being barreled up. Normally they are rolled onto special 'rool on roll off' barrel containers that are then shipped to Leyland Depot. All outgoing goods to customers are 'picked' at leyland depot and sent out through a variety of hauliers.
On occasion Leyland depot is full. At this point each factory has an overflow container park which holds a buffer stock. Wach factory has 2 hauliers on retainer to put these materials into these buffer stocks and move them when space allows to Leyland Depot. These containers are loaded by forklift and hence more expensive to run than the roll of roll off system.
I have attached a copy of a Visio image with what I have captured to date and it does not look correct!
Any help would be appreciated.