Thanks Rick, speed is what I am going for.

>You should also consider:
>
>

>IF  TYPE("loMyObject." + cNewProperty) = "U"
>   ADDPROPERTY(loMyObject,cNewProperty,"Test Value")
>ENDIF
>

>
>If you know the name of the property and it's not a variable you can also use VARTYPE() for better performance yet:
>
>

>IF  TYPE(loObject.cProperty) = "U"
>   ADDPROPERTY(loMyObject,"cProperty","Test Value")
>ENDIF
>

>
>I suspect either of these will be faster faster than either PEMSTAUS and certainly AMEMBERS.
>
>+++ Rick ---
>
>>I have a program that checks to see if a property already exists on an object before adding it, which would be the better way to determine if the property already exists?
>>
>>

>>    AMEMBERS( m.laPropertySet, m.loMyObject )
>>    IF ASCAN(m.laPropertySet,[cNewProperty],1,0,1,1)>0 && Case insensitive search, 0-not found
>>      ADDPROPERTY( m.loMyObject, [cNewProperty], [Test Information])
>>    ENDIF
>>    
>>    && or should I do this instead:
>>    
>>    IF PEMSTATUS( m.loMyObject, [cNewProperty], 5)
>>      ADDPROPERTY( m.loMyObject, [cNewProperty], [Test Information])
>>    ENDIF
>>

>>
>>What do you think?