1. 1 Specification of IT Systems Mandatory Exercise Week 3

2. 2 Assignment 1.Make the necessary ERD diagrams for your system. 2.Make a dictionary for your system. 3.Validate your descriptions with the four approaches described in Wieringa 9.5. Discuss why your descriptions are complete.

3. 3 Exercise 1 - ERD

4. 4 Exercise 2 - Dictionary (1) Work item. Entity type. A description of a piece of work. It contains information on deadline, description, priority, room and building. It is a part of a process instance. Serviceman. Entity type. A worker know how to pick and complete work items. Process instance. Entity type. An instance of the process definition. A process instance describes how far a process has come and what work item's are enabled. Enabled work item. Entity type. If all resources are available for a work item to be completed, and preceding work items are completed.

5. 5 Exercise 2 - Dictionary (2) allocation(s: Serviceman wi : Work item). Relationship name. A serviceman s has claimed a work item wi. claimed. Attribute name. status(wi : Work item) = claimed, means that the work item has been put on a servicemans task list.

6. 6 Exercise 3 - Validate description zDone by you…