No. qualitative is the research method.

Usability is what is referred to as the administration of the instrument in research method. Also, within the research method, you will find validity and reliability.

Research design is a blueprint or panning for research work and research method is an action or tool to make the plan success,

scientific method is the accepted standard of research methodology.

research design is the blue print showing the structure of the research process, while research method is the means of gathering evidences for a particular research design.