I need help for my theoretical framework

I'm not familiar with Gagne's work ... but you seem to have already established a theoretical framework -- Gagne's nine levels of instruction.

So, your first step would be to familiarize with Gagne's theoretical model ... then go through the basic steps of your assignment. If you simply need to write a paper on how that model can be used in pediatrics, take each aspect of the model and show how it relates (or can be applied) to pediatrics. If you need to actually design a research project ... use the model to describe the topic you want to study, define a particular research question, etc. Go through each steps of the basic research process and use the model at each step to define your terms and make your choices about design, measurements, data collection, analysis, etc.

Does that help? I can't tell from your original post what your actual problem with using the model is.

It sounds like you need to clarify those questions with your intructor. Does he/she expect you to develop new theory ... or to simply illustrate the use of 1 theory? Are you supposed to write a proposal for a research project that would involve collecting and analyzing data yourself? Or is your "research" paper, one that is simply meant to be a summary of other people's research and other library materials. How are you using the word "research"?

From your posts, I still don't understand what your actual assignment is. I suspect your don't fully understand that yourself and you need to go to your instructor and get that clarified in your mind before you will be able to procede further.