To ensure a project's success, you need to select the right needle.
Most of us can't tell the difference by looking at needles. But put the wrong needle in your machine, or use the wrong needle for your fabric and/or thread and you will see the difference. You can get puckered seams, break or shred thread, punch holes in your fabric and, at the very least, produce an inferior stitch. Whatever your machine, even the latest computerized model, needle selection can make or break your stitch.