Well, yeah, kinda. It's not quite as bad as it looks, because "the development of democracy" incorporates:
-extension of the franchise
-redistribution of parliamentary seats
-changing nature of political parties
-decline of the aristocracy
-improved voting conditions
So you can say how all of them were a gradual process, indicate change all throughout the era, but then perhaps say that there were given "turning points": for example, you could say the development was not steady because voting conditions only genuinely improved after the First World War.