Wikipedia:Integrate

Search various categories for stub articles. Stub articles belonging to a specific category with minimal content should be merged into a meta-article covering that subject matter.
Rather than delete old pages, redirects should be employed to reduce the chance of users making an article for the same subject. Furthermore, if the stub does have a chance to move beyond stub status, the article can be re-developed on its own merits as a category member.
Duplicate references should be identified by human or bot as a method of detecting merge-candidates, or overlooked category members. Furthermore, duplicate references that are required should be converted to a template that would appear uniformly on all category member pages.

Parent categories of significant volume should be reasonably sub categorised. Template:CatDiffuse explains this process.
Templates should be used to eliminate redundant content within category articles.
Templates should also be used to link together disparate articles that relate to each other, but may not always be in the same category. See Wikipedia:WikiProject_Succession_Box_Standardization/Templates for suitable templates.

Integration is white matter: it links together elements for processing.
Integration is government in the sunshine: it keeps things in the open and not obscure.
Integration may require ion thrusters: they're slow, but effective and efficient.

Practical ways to help

Wikipedia:Proposed mergers — help form consensus about proposed mergers
Wikipedia:Articles for deletion — if you !vote for an article to be merged at AfD, then please let the closing editor know whether you'd be willing to merge the articles yourself. Just "* Volunteer" to help!
Wikipedia:WikiProject Proposed Deletion Patrolling — help editors preserve any valuable material in the Category:All articles proposed for deletion