Remember that you have by now used your skills in ‘person first thinking’, followed by ‘define’ before considering the ‘what if’ and ‘making a plan’.
‘Testing’ is the time to try implementing your plan. For example, if we return to the lunch box scenario this is the time you try out your idea of moving the drink bottle so Mick’s sandwich is not cold. So now, in the ‘testing’ period, you would pack the lunch box and put the cold drink bottle in a different part of Mick’s school bag.