1) That's a tricky one, because all the options are slightly different. They all have slight nuances. "Sequential" means "in sequence": A happens before B, which happens before C, etc. and it has to go in that order. There is a connection with the previous word "logical". Frequently, you could describe something sequential as deliberate or designed. Sequential movements are involved in synchronized swimming. "Continual" means something more like "repeating, not stopping" His continual whining irritated them. "Consecutive" means that events happen one right after the other in a chain, like a string of firecrackers going off, one by one, down the line.This word specifically involves chronology, meaning, events in time. She had set a personal record: running every day for 20 consecutive weeks. A "Successive" event means an event "following" another event. A "succession" is a chain. The pitcher threw three successive outs (in baseball). This is frequently used as an adverb: His face grew successively larger as it swelled. Consecutive and successive are extremely closely linked, and are even listed as synonyms in some dictionaries. The difference will be a tendency in how each is used. 2) You could use "overlap". "Coincide" here specifically means "are the same": The interests of employers and employees are not always exactly the same. Good questions! I hope these answers helped!

1. Sequential = in some type of numerical order (1, 2, 3, a, b, c). I would consider "consecutive" to mean "sequential". Continual = starting and stopping. (Night and day are continual processes.) Successive = following in TIME sequence, not numerical sequence (at 1 hour, at 2 hours, at 3 hours, etc.) Experiment 1-09:00; 2-10:00; 3-11:00; 2b-11:30 (Experiment 2b was deemed to be a needed experiment. Because it is related to Experiment 2, it was "numbered" as 2b (out of sequence) but it was performed successive to (after) Experiment 3 chronologically. 2. The interests of employers and employees do not always coincide ( " overlap " can be used to replace " coincide" and the meaning is the same ? ) -- To me coincide implies 100% overlap. -- Nonspecific "overlap" could be by any amount between 0 to 100%.