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The core of LEXSYS is the central query modules which takes inputs from one or more of the 47 search criteria classified into five groups (i.e. ecology, system niche, uses/contribution, trap crop and avoid). 

## 3.1.2 Ecology

In ecology, the selection criteria are based on climatological parameters such as rainfall, altitude, mean temperature, soil characteristics, drought and water logging. The selected parameters and values are primarily the interest of the user or prevailing situations in the geographical zone, environment or ecology of his/her choice. 

## 3.1.3 System Niche

The system niche identifies plants' biological characteristics of legume species that can be adapted to an existing farming system. These characteristics are morphologic, physiologic or phenologic 

## 3.1.4 Contribution/Use

In contribution the attention is application of plant products or plant characteristics for one or more human needs. The need could be industrial, domestic or economic. 

## 3.1.5 Pest-Avoid

In Pest-Avoid selection, the concern is to select plants that do not have one of more of the traits identified as parameter in the selection. 