Anna of http://www.stitchbitch.blogspot.com in a recent blog entry inquired into people's stitching strategy--whether they worked on only one piece until finished, alternated pieces, kept track of expenditures, etc. Everyone has a different approach to their stitching.
As a shopowner, I basically do NO personal stitching. It is either for a shop model or contract stitching for a customer. I try to work on two projects: one at home and another at the shop. I started this approach when I was forgetting my current stitching project at home when I was at the shop; and vice versa. Simple solution, have 2 projects; one at each location. No longer an excuse for stitching inactivity. However, over the years I have discovered a tendency when it comes to class offerings that I lose interest in stitching them once someone can recognize their appeal. So, I have a multitude (love that word!) of canvases that are semi-finished. Notice I don't say half-finished---because many of them aren't. At least on many of them I have stapled a bag to the back of the project with the fibers that were used. Admittedly, I am not always so prudent.
Last summer I tried to finish several projects that I had started in previous years. On May 6, 2015, I discussed them. I have almost finished the Clara Wells purse, but took a shop break and stitched a bunny from Associated Talents. After I finished that, I continued stitching on the Associated Talents monogram canvas (I did, then passed it on to Macy for her to do for her shop stitching). Of course, I am eyeing other projects. Right now I have interrupted my shop stitching of the spool angel to do some counted needlepoint for a customer. It's a wedding sampler and there's a tree on it that has been a problem for the customer. I guesstimate that it will take me the next two days to complete. I didn't photograph it because she has already stitched the names of the bride and groom.