Before conducting the needs assessment, it may be helpful to consult census data available in geographical units to learn more about the population being studied. This is an example of use of .

Secondary data

Explanation:

Secondary data -

It refers to the data , which is organised or gathered by the someone apart from the user , is referred to as the secondary data .

The common source of information of the secondary data are -

information from the government departments , some previous record or data which is used for the research purpose .

Hence , from the given information of the question ,

The correct answer is Secondary data .  

answer; ///i believe that the correct answer is because the house and senate frequently pass different versions of the same bill;

it is a better alternative