The problem with CCM metrics was found in the file "org/jpeek/metrics/CCM.xsl" in line 65 the variable 'ncc' is assigned the number of methods connected by edges, but^ according to the definition NCC is the number of connectivity components in a graph.

Definition of graph component - https://en.wikipedia.org/wiki/Component_(graph_theory)

An example implementation of an algorithm for finding connectivity components in a graph - https://www.geeksforgeeks.org/connected-components-in-an-undirected-graph/

The class on which the metric works in error:

public class Worker {

    String name;

    public void one() {
        name = "1";
    }

    public void two() {
        name = "2";
    }

    public void three() {
        name = "3";
    }

    public void four() {
        name = "4";
    }

    public void five() {
        name = "5";
    }

}

In the above example you can see that all 5 methods are one connectivity component, however, jpeek says that NCC = 5, so we can conclude that instead of connectivity components he counts the number of connected methods.

According to the definition of CCM, the class given as an example should get a score of 1 because:

Indeed, if we calculate the connectivity components of the graph from the example, then NCC = 1, substituting the correct value in the formula:

The CCM metric will be 1, this will be the correct answer.