Final answer:
Naturalistic observation is the best method for capturing real-world behaviors in descriptive and experimental research, providing valid data and a higher ability to generalize findings to real-life situations.
Step-by-step explanation:
The method of descriptive and experimental research that captures "real world" behaviors is naturalistic observation. This approach involves observing behavior in its natural context without any manipulation or intervention from the researcher. Examples include studying children on a playground or documenting shopping patterns in a mall. Naturalistic observation offers the honesty of data collected in a realistic setting and has a high degree of ecological validity, enhancing our ability to generalize findings to real-world situations.
While other methods such as case studies offer in-depth information and laboratory observations allow for greater control, neither captures real-world behaviors as effectively as naturalistic observation. Case studies can be limiting due to the specific nature of the subjects involved, making it difficult to generalize results. On the other hand, laboratory observations can introduce artificial elements that may influence behavior.