it refers to the availability of time and financial, human and material resources that will determine the true scope of the investigation.

It is defined as the ¨tentative investigation of the investigated phenomenon, formulated as a proposition, about the relationship between two variable.

It is not one of the level of investigation:

These are the entities or objects who behaviors are being studied. these units can be participannts, groups, institutions, schools and professors

These are the qualitative or quantitative characteristics of the analyzed units.

These are the links that relate the units of analysis with the variables and the variables between themselves.

It is the property , quality or characteristic of a reality, event or phenomenon that has the ability to influence or affect other variables.

It is the characteristic, prooperty or quality of a reality or event that we are investigating.

Are those that theorically affect the dependent variables, but cannot be measured or manipulated.