The easiest thing is probably to just print out the parameter values:

def is_merge(s, part1, part2):
    print(s, part1, part2)
    return False

In the case you mentioned, you'll see that s has the value "Making Progress".

The function is supposed to return True or False, so if you don't pass it, you are probably returning the wrong one. :-)

(I guessed that you're using Python from your previous submissions. In the future, it's always handy to state your language when you are asking about a multi-language kata.)

Let me know if you're still stuck and I'll try to hint you in the right direction.

Good luck!