"So, the approach I’ll take is threefold. First, characteristics I think are minimally necessary to qualify as an Arminian. This is my “generous Arminianism” definition. Second, additional characteristics I think are very valuable for an Arminian to possess. Third, characteristics that I think disqualify a person from being considered an Arminian.
Before launching into it, however, I should reveal how I go about making these decisions. First, I study the history of Arminianism beginning with Arminius himself and his immediate followers, the first generation Remonstrants (up through the 1620s when all the Remonstrants seemed to be faithful to Arminius’ own teachings). Second, I consider what scholars, theologians, leading ministers who regard themselves as Arminians believe. Third, I look at what scholars who are not Arminians say about it. My “anchor” tends to be Arminius himself."
To continue, Olson and Arminianism