[802.3_ISAAC] Cyclomatic Complexity

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Subject: [802.3_ISAAC] Cyclomatic Complexity

From: "Schedl Anton, EE-320" <00004999f4c9f180-dmarc-request@xxxxxxxxxxxxxxxxx>

Date: Tue, 5 Aug 2025 15:16:37 +0000

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Reply-to: "Schedl Anton, EE-320" <Anton.Schedl@xxxxxx>

Thread-index: AdwGG5FKzNggHlQuSdyFhFpkXlKPcA==

Thread-topic: Cyclomatic Complexity

Hello Ragnar,

there is a misunderstanding on the recommendations of the HIS (Herstellerinitiative Software initiative).

The HIS initiative does not limit the complexity score to 10 or any other value.

The referenced paper is a recommendation for handling complexity properly, not for limiting complexity.

The same is true for the tool "Cyclomatic Complexity method" that you used and for ISO26262 ==> no limitations but recommendations to handle software complexity properly!

The recommendation of HIS is to use tools like Cyclomatic Complexity to monitor the complexity of code and re-structure the code once you have reached a certain complexity level (e.g. 10).

Looking at the analysed proposals, you can see in your presentation that the restructuring has perfectly been done in the specified proposals.

Following the link in your presentation you can also see the recommendation of McCabe and also the controversial discussions about the score:

[… One of McCabe's original applications was to limit the complexity of routines during program development. He recommended that programmers should count the complexity of the modules they are developing, and split them into smaller modules whenever the cyclomatic complexity of the module exceeded 10.^[2] …]

[… However, it also noted that in some circumstances it may be appropriate to relax the restriction and permit modules with a complexity as high as 15. …]

Best Regards,

Tony

BMW Group

Dr. Anton Schedl

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