Decisions and Logic

If you’re used to flowcharting, or are familiar with the richness of BPMN, one of the things you’ll notice is that… we don’t have anything but a rectangle symbol. One of the symbols that is not available is the decision symbol, or diamond shape. It represents a decision point in a process flow. The question, therefore, is: How do I represent this, using UPN?

Click to open Learning Objectives

LO1-1 Capable of accurately documenting decisions using UPN

LO1-2 Being able to document AND/OR logic using UPN


Well, a decision is nothing more than an activity. So in the example below, we “Lookup customer details”. As we do this, we already know whether we’re dealing with an existing or non-existing customer. Basically, we can use the text in the diamond as an outcome of the previous activity.

There are situations where you want to follow a detailed decision tree (using many diamonds). Have a look at the video below, where Walter will describe this with a working model.

Another challenge can be how to represent logic gates. The simplest logic gates are AND and OR. So, after executing activity A you would get 2 flowlines that trigger both activities B AND C. Or: after executing activity A you would get 2 flowlines that trigger either activity B OR C. Whilst this tends to be already pretty technical, you could represent this on business level by joined lines (AND), or separated lines (OR).

Another short video describes how logic gates work within UPN.

Below are a couple of examples of decision and logic diagrams represented in UPN.

Example 1


Example 2

These decision and logic based practices allow you to furnish decisions with the same amount of contextual detail that you do with any other activity. It also retains the ability to create divergent, convergent, and parallel, business process dependent on the logic of your organisation.

What’s next

Next, you will take a short, theory and practical quiz. Select it from the menu below.

This quiz will help you to recognise the skills and knowledge you have gained, and identify any areas you still need to explore and learn.

Remember, you can revisit these pages, or ask us for help if you get stuck. Once you pass the quiz, click “Next Module” to move on to Module 6.