You must be much more specific in your question. There are entire textbooks written on this subject.
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the best method to collect primary data is to make a Baseline Data or using the method of Rapid Rural Appraisal.
Collecting the data
This method is useful for collecting information about a population that is too large for every member to be studied.
I think all of those steps are in the scientific method
naturalistic observation
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Me
A survey or an experiment.
o0o
The Therapeutic Riding Association of Virginia Incorporated or TRAVInc bases its workshops around the annual goal of collecting evidence for and popularizing the use of horse-riding as a method of rehabilitation therapy.
collecting the data
The Scientific Method
Which of the following devices for holding or collecting evidence is designed to be sealed using heat
Hugh Seidman has written: 'Collecting evidence'
There are many methods of the data collection: 1. experimental method in the laboratory 2. survey method
Collecting salt made from the evaporation of sea water