reclassify vector data from multiple source data fields (ArcGIS) (ModelBuilder)

I am using ArcGIS 10.1 and ModelBuilder. I am not familiar with Python.

My question is very similar to ReClassify Vector Data Between Values using ArcGIS Desktop? . However that question is about reclassification using the values from one other field.

I have experience of using this type of reclassification within the Calculate Value Tool.

However I wish to base a reclassification on the values from more than one source data field. For example from two fields - "Land" and "WellYield". ideally I'd like to be able to run classifications from 2 or 3 source fields.

I know the following code is wrong because i have not defined the "Land" field.

e.g.

parser: Python

    Expression:
    Reclass(!WELL_YIELD!, !Land!)

    Code Block:
    def Reclass(WellYield, Land):
      if (WellYield == 'Make'and Land == 'Natural'):
        return 'Greenspace'
      elif (WellYield =='Multiple'  and Land == 'Natural'):
        return 'Not Greenspace'

Any help or tips on the correct code would be much appreciated.

I have just been testing some outputs by trial and error.

The above code seems to work now for classifying by different data fields. I will test further by three fields.

Any insights or advice would still be appreciated.