Hi Thando and other PYC''ers,

I have definitely NOT forgotten about you!   
 
Ill-formed : bad construction of the chart ; the syntax not followed. ie labeling outside boxes.
Invalid : The chart is invalid because the information is incorrect or the flow of the chart is incomprehensible. ie If I were to tell you that the first step in making a cup of tea, was drinking the tea..... make sense ? 
I dont have your assignments with me, please could you post the question on the blog and as for perceptual constancy, lets have a discussion in class. 

chow for now