Final answer:
The numbers of iron triangles and issue networks have changed over time due to a shift in understanding policy-making processes and the recognition of the importance of diverse perspectives and collaboration.
Step-by-step explanation:
The numbers of iron triangles and issue networks have changed over time. The iron triangle, which is a relationship between an interest group, a congressional committee, and a bureaucratic agency, has been viewed as an outdated concept. Instead, a more open pattern called an issue network has emerged, which includes various interests and political actors working together on a specific issue or policy. The change in numbers can be attributed to a shift in how policy-making processes are understood and the recognition of the importance of diverse perspectives and collaboration.