Definition
A theoretical framework is a foundation of established theories that explains why a phenomenon occurs, whereas a conceptual framework is a model that the researcher constructs to show how variables relate within the study.

Introduction
Before collecting data, a researcher needs a logical structure to connect ideas, concepts, and variables. This structure forms the backbone of any study. Theoretical frameworks come from existing bodies of knowledge, such as Maslow’s hierarchy of needs, while conceptual frameworks are built by the researcher to visually or logically link variables within the chosen context.

Explanation
A theoretical framework grounds the study in existing knowledge. It provides the “why” behind the research. For example, when studying employee motivation, Herzberg’s Two-Factor Theory explains that motivation arises from intrinsic factors like achievement and recognition rather than salary alone.

The conceptual framework, on the other hand, represents how the researcher interprets and applies the theory to the specific study. It is usually illustrated through diagrams showing relationships between independent and dependent variables. For instance, the conceptual model for motivation research may link salary (IV), recognition (IV), and job satisfaction (DV), all connected through the theoretical base of Herzberg’s theory.

In essence, the theoretical framework is borrowed; the conceptual framework is customized.

Key Takeaways
Theoretical frameworks offer academic legitimacy, while conceptual frameworks provide clarity and direction for measurement. Together, they prevent conceptual confusion and help in hypothesis formulation.

Real-World Case
Google’s Project Aristotle (2012–2015) studied what makes teams effective. The researchers used psychological safety theory (theoretical framework) and then built their own conceptual framework linking trust, dependability, and clarity to team performance. Their findings reshaped how Google manages teams.
Reference: https://rework.withgoogle.com