The phrase "overall scheme" refers to the big picture or the entire plan or strategy. It means considering all the different parts or aspects together to understand the complete plan or idea. Full definition
Good communication and coordination of the scheme is vital to its success: overall the scheme involves twelve local state schools and Cathedral Education, has thirteen St Albans School staff involved and between sixty and seventy Lower Sixth pupils who assist with Partnership activities on Friday afternoons. (schoolstogether.org)
Compared with the «regular» W - 12 car, the Speed receives a unique duo - tone interior color treatment, with a dark overall scheme accented by splashes of bright, contrasting leather (it looks fabulous). (automobilemag.com)
Seems like a minor visual refresh tacked on to the greater overall scheme of trying to sell you more books on your home screen. (blog.the-ebook-reader.com)