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I have tried Dia, but it does not seem to provide a convenient set. Particularly, I cannot find the self-directed circle in Dia.

I drew the illustration in Word, but it is not very convenient. (The self-directed circle is a circle + an arrow which overlaps the line.)

enter image description here

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closed as off-topic by Excellll, Mokubai, gronostaj, Tog, Dave M Sep 7 '13 at 19:31

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Questions seeking product, service, or learning material recommendations are off-topic because they tend to become obsolete quickly. Instead, describe your situation and the specific problem you're trying to solve. Here are a few suggestions on how to properly ask this type of question." – Excellll, Mokubai, gronostaj, Tog, Dave M
If this question can be reworded to fit the rules in the help center, please edit the question.

It is called a "sequence diagram". I've not seen any that can do the self-directed circle though.

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You can try the websequencediagrams which is an online sequence charting tool. You can use it for free unless you must use more advanced options. You can choose between few different designs and is very easy to use.

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It does not seem to have self-directed circles. – user69835 Feb 26 '12 at 7:14
There is a Signal to Self option which allows you to return the flow from a participant to itself. For example, if you have a participant named Alice you can do the following: Alice -> Alice: Text – Eugene S Feb 26 '12 at 7:35