i.e. there are no intermodular links. This means that modules are isolated and can be seen as independent classic RBNs, with different attractors of different lengths. However, the MRBN will consider different combinations of the same modular attractors as different attractors. This can be better understood with an example. Let us have a small MRBN M = 2 ,N = 3 ,K = 2 ,L = 0. Since modules have no interaction ( L = 0), this MRBN is equivalent to two separate classical RBNs. Let us assume that the first module has a point attractor: 001 → 001 and an attractor of period 2: 000 → 111 → 000; and the second module has a point attractor: 000 → 000 and an attractor of period 3: 100 → 010 → 001 → 100. Thus, the combinations of these RBN attractors will yield four attractors in the MRBN: Considering that in RBNs A grows algebraically with N [16], MRBNs with several modules M and κ = 1 will tend to have much more attractors on average than a RBN with the same N$_{T}$ and K$_{T}$ . This is because the MRBN will have as different attractors all the possible combinations of all modular attractors. As intermodular links L are added and κ decreases, changes in the states of nodes which have L links as outputs might perturb and even destroy attractors. When κ is minimal, the organization of the MRBN is more similar to a classical RBN, since there are less restrictions on where to assign links (in general (for M > 2), there are more possible intermodular links ( M · ( M − 1) · N $^{2}$) than possible intramodular links ( M · N $^{2}$)). The A results for cases 4, 5, and 1 are compared in Figure 6. It can be seen that µ is also relevant for A . More modules (low µ ) imply more potential combinations of modular attractors, which implies a higher A for MRBNs. Case 4, which is equivalent to a classic RBN has a maximum 13 1. The two point attractors: 001000 → 001000. 2. The first point attractor and the period three attractor: 001100 → 001010 → 001001 → 001100. 3. The period two attractor and the second point attractor: 000000 → 111000 → 000000. 4. The period two and period three attractors: 000100 → 111010 → 000001 → 111100 → 000010 → 111001 → 000100.