Answer:
Both shyness and birth order
Explanation:
An operational definition is a clear concise and very detailed definition when it is applied for data collection. It is a fundamental need for an operational definition when collecting data. This definition is important when any decision is made about data is correct or not.
It is used at any time when data is collected. The data which is not defined result in an erroneous result. The researcher will assume that who is collecting the data to understand how the task completed. Every person has their view about the collection of data. Only the operational definition eliminates the ambiguity in data collection.