The basic process of taxonomy that requires intensive laboratory and field studies is identification.

Identification:
Identification is the process of determining the identity of an unknown organism by making use of various characteristics and features. It involves the use of different taxonomic keys and techniques to identify the organism. This process requires extensive laboratory and field studies to gather data and determine the characteristics of the organism.

Laboratory Studies:
Laboratory studies are required to analyze the morphological, anatomical, and biochemical characteristics of the organism. These may include microscopic examination, genetic analysis, and biochemical testing.

Field Studies:
Field studies are required to observe the organism in its natural habitat, and to gather data on its behavior, ecology, and distribution. These observations provide valuable information that is used in the identification process.

Characterisation:
Characterisation involves the determination of the characteristics and features of the organism. This is an important step in the identification process, as it provides the necessary data to classify the organism.

Classification:
Classification is the process of grouping organisms into categories based on their characteristics and features. This process requires the use of a taxonomic hierarchy to organize the different groups of organisms.

Nomenclature:
Nomenclature is the process of naming organisms based on their classification. This process follows a set of scientific rules and guidelines to ensure consistency and accuracy in naming.

In conclusion, identification is the basic process of taxonomy that requires intensive laboratory and field studies. It involves the determination of the identity of an unknown organism, and the use of various taxonomic keys and techniques to classify it. This process requires the gathering of data on the morphological, anatomical, and biochemical characteristics of the organism, as well as observations of its behavior, ecology, and distribution.