Abstract
One of the most important decisions facing married couples is how many children to have and when to have them. Unfortunately, research to date on how the number and spacing of siblings affects the outcome for each child does not provide parents with the information they ought to have. Two reasons for the relative inadequacy of current research are outlined and shown to be remediable. The first of these is that research has been conducted by scholars in different fields between which there have been substantial communications barriers. The second is that research has been performed on data sets gathered for other purposes which do not contain sufficient information, particularly concerning the IQ of the parents and the spacing between siblings.

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