a) what is the theory? 

b) what are the major concepts or variables that theory is concerned with? 

c) when/how was the theory founded? 

d) has it changed over time, and if so, how? 

d) what are the major foundational or important studies concerning this specific theory?

Based on Linear Model of communication- Berlo's S-M-C-R Model

Link of the Berlo SMCR Model:

 

https://www.communicationtheory.org/berlos-smcr-model-of-communication/