Aaron Ramsey conceded Arsenal remain a work in progress after head coach Unai Emery collected his first win in charge with a 3-1 derby triumph against West Ham.
The hosts were forced to come from behind at Emirates Stadium after Marko Arnautovic arrowed a fine 25th-minute opener into the bottom-left corner.
Nacho Monreal found a swift response and West Ham felt Arnautovic's absence after injury robbed them of the striker with an hour played.
"In the second half we created a few opportunities and it's a new process for us," Ramsey said.
"We had a tough start and are trying to improve every game. He [Emery] wants us to press high up the pitch."
The win followed losses to Manchester City and Chelsea and Wales midfielder Ramsey added: "It was difficult, it was my first 90 minutes - even [including] pre-season - so I am glad I got that in the system.
"We are progressing every game. It was open at times, but I am glad we got a win."
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Ramsey returned to Arsenal's starting line-up in place of Mesut Ozil, with ESPN Brasil reporting the Germany playmaker's absence from the matchday squad stemmed from a training-ground row with Emery.
