Expertise and Assessment
A best-case scenario for the development of expertise is making a lesson plan. These written lesson plans are crucial in the development of expertise in that they describe the mental plans for the lesson. This way, the novice educators can be able to determine and differentiate the decisions that are more important and those that are less important (Louis, Lawrence & Keith, 2007). These lesson plans are crucial in that they enable the aspiring expertise educators adhere to the track of the lesson and an equilibrium of both content and student-centered instruction.
The method of observation and inference that seems most applicable to my role as an educator is studying the students feelings and thoughts. By frequently studying the actions, reactions, expressions and the behaviors of the students to classroom activities and lessons learned in the class, I can get to know what their thoughts are, or their individual state (James et al 2001). This method seems most applicable because by using the expressions of the student; I can be in a position to infer various characteristics exhibited by the student such as boredom, being inspired, or if they have problems with the content of lesson that I am teaching. It is through the understanding of the students by observing them that I can make the necessary measures on the lesson such as adjusting it.
The method of observation and inference which seems most applicable across the greatest number of situations is scientific observation. This is because in scientific observation, phenomena is used in the recording of information. In scientific observation, the observer goes to the classroom anticipating a specific outcome, such as bad conduct (Karl, 2009). The one observing goes to the observation location and observes the conduct of the teachers and the students and then uses that observation to make a conclusion. This seems the most applied because new students and teachers— who continuously enter the education sector— get must get assessed by the administrators.

References
Cohen, L., Manion, L. & Morrison, K. (2007). Research Methods in Education. Oxon: Routledge.
Ericsson, K. A. (2009). Development of Professional Expertise: Toward Measurement of Expert Performance and Design of Optimal Learning Environments. Cambridge: Cambridge University Press.
Pallegrino, J. W., Chudowsky, N., Glaser, R. & National Research Council (U.S.). Division of Behavioral and Social Sciences and Education. Committee on the Foundations of Assessment. (2001). Knowing What Students Know: The Science and Design of Educational Assessment. Washington, DC: National Academies Press.