A technique is a procedure used to accomplish a specific activity or task
A population is all the organisms that both belong to the same species and live in the same geographical areaProcess or processing typically describes the act of taking something through an established and usually routine set of procedure steps to convert it from one form to another, as a manufacturing oradministrative procedure, such as processing milk into cheese, or processing paperwork to grant a mortgage loan, or converting computer data from one form to another. A process involves steps anddecisions in the way work is accomplished
In science and research, attribute is a characteristic of an object (person, thing, etc.). Attributes are closely related to variables. Variable is a logical setof attributes. Variables can "vary" - for example, be high or low. How high, or how low, is determined by the value of the attribute (and in fact, an attribute could be just the word "low" or"high").[
Research can be defined as the search for knowledge, or as any systematic investigation, with an open mind, to establish novel facts, usually using a scientific method
Methodology can be:"the analysis of the principles of methods, rules, and postulates employed by a discipline";
"the systematic study of methods that are, can be, or have been applied within a discipline".
Adocumented process for management of projects that contains procedures, definitions and explanations of techniques used to collect, store, analyze and present information as part of a research process ina given discipline.
the study or description of methods 
Method can be defined as a systematic and orderly procedure or process for attaining some objective.
Methodology doesn't describe...