Determining the sign of control derivatives

[eqm]

I'm having quite a deal of trouble trying to figure this out. Say, for example, you wanted to have a statically stable aircraft. How do you determine what the signs (positive or negative) of the control derivates need to be for this condition to be satisfied ( C_Xα, C_Zα, C_mα, C_mq, C_Zδe, etc) ?

 

[Stella.Physics]

what do these signs stand for?