Modelling Techniques
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Modelling Techniques

How is this modelled and taken forward?

The following UML artefacts can be used to model these concepts, in order them to specify them to take forward into development.

bullet Schedule
bullet Enterprise level activity model
bullet Task
bullet Enterprise level activity model
bullet Activity
bullet Component level activity model
bullet Enterprise use case narrative
bullet Rule
bullet Operation on Analysis class
bullet Rule Set
bullet Sequence model showing rule collaboration.
bullet One per applicability scenario

A task is a building block of a process that achieves some high level goal in the business. It can thus be seen as being closely analogous to a enterprise level use case (UC).

Tasks then break down into a number of activities in a similar way that a UC breaks into a number of steps.

An activity then is an execution or implementation of a number of rules. Because different rules can potentially apply in different circumstances (and in different order) for the same activity, rule sets can be defined.

Figure showing relation of business rules to the activities

Activities that make up a task should be defined in an activity model

If a task is seen to be a discrete UC, then the activities can be seen as steps within the UC. This is not to say that each numbered step should have a separate named activity, rather this should be logical groups of steps.

This can be shown in an activity model, with any product specific differences in flow shown. A single model can suffice or separate ones if the differences between specifics and generic case is too great. 

Figure showing relation of Activity to Task

Sets of Rules that make up an Activity should be defined in a sequence model

Each activity within a UC should have sequence models that describe what rules apply, for given scenarios in what sequence and how they collaborate. Since these rules are operations from the ACM artefacts the participating classes form part of this model.

 Figure showing sequence models and Rule Sets


Note that these scenarios are effectively the rule sets. Since different rules can apply say to Bonds to say the generic case, separate scenarios should be put for each of these cases, each clearly showing what it applies to (e.g. “bond specific”, “swap specific”, “generic” etc).

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© 2002-2005 Codel Services Ltd

This paper has been prepared by Codel Services Ltd to illustrate how structured business modelling can help your organisation. Codel Services Ltd is an IT Consultancy specialising in business modelling. If you would like further information, please contact us at: Deryck Brailsford, Codel Services Ltd, Dale Hill Cottage, Kirby-Le-Soken, Essex CO13 0EN,United Kingdom. Telephone: +44 (0)1255 862354/Mobile: + 44 (0)7710 435227/e-mail: