Final answer:
IBM developed the Selectric typewriter primarily for changes in typefaces, enabling more versatile document production and influencing the progression of computerized typesetting and printing.
Step-by-step explanation:
The reason IBM developed the Selectric typewriter was for the changes in typefaces. This invention revolutionized the way we approach typesetting by offering the ability to easily change type styles. Initially, typewriters could only use a single font, which was a significant limitation for producing varied documents. The Selectric typewriter integrated a type ball that could be swapped to change font styles, allowing for more versatility in document creation. This typewriter was a precursor to more advanced word processors and computers which eventually incorporated even more sophisticated features such as multiple fonts, WYSIWYG editors, and connectivity with high-resolution printers.
IBM's Selectric typewriter was a significant step in computerized typesetting and printing, leading to both typography advancements and increasing productivity in offices. It not only allowed for the creation of documents that could resemble professional typesetting but also increased the typing speed, as typists could type more pages per hour compared to manual typewriters.