The System Center Integration Guide provides an overview of the automation and integration options for each of the System Center components. It is intended to be a starting point for determining which customization method that you should be using for different scenarios and where to get content for those topics.
The System Center 2012 - Operations Manager Authoring Guide provides content on creating and customizing management packs in System Center 2012 - Service Manager. This guide is intended for the beginning to intermediate user who requires an introduction to management pack concepts and who will work exclusively in the Operations Console.
The Operations Manager Management Pack Authoring Guide provides detailed content on designing and creating management packs for Operations Manager. This content is intended for the intermediate to advanced user who requires scenarios beyond Operations Console wizards or just wants to have a deeper understanding of how management packs are structured and processed.
The System Center 2012 - Service Manager Authoring Guide provides content on creating and customizing management packs in System Center 2012 - Service Manager. This guide is intended for all users who require management pack concepts in addition to authoring different management pack elements. This content covers both the Service Manager console and the Service Manager Authoring Tool.