parents must give the toy a score out of five for each and add them up.

　　in a separate sum, then they must estimate the amount of time in hours a child will play with the toy regularly (t) and multiply it by how many months it is likely to remain of interest (l).

　　the two figures must then be divided by the square root of the cost (c) and added to the total score from the criteria section.

　　simple? for those who did not quite follow, it works out as: t x l + pi + po + cr + s + u + h / square root of c

　　"a toy may score higher for one child than another but that's an important part of the exercise," said dr arnall. 

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