Over time, the Texas legislature has seen an increase in the average number of years legislators hold office, expanded its workload, developed complex rules and procedures, and taken on professional staffs. This is all evidence of the of the Texas legislature.

Institutionalization.

Explanation:

This was been postulated by a German called Max Weber and this was particular in the 20th century. Institutionalization is a defined to be a process of embedding certain rules which include social lives, norms, standard and values. That was why at a certain time, increment in the average number of years legislators hold office, developed complex rules and procedures, and taken on professional staffs were seen and are ethical norms from the institutionalization process of Texas legislature. Therefore, it can be seen to be a human activity that adapts, installs, changes rules and procedures in both social and political spheres.