Arranged with regard to method; disposed in a suitable manner, or in a manner to illustrate a subject, or to facilitate practical observation; as, the methodical arrangement of arguments; a methodical treatise
If you describe someone as methodical, you mean that they do things carefully, thoroughly, and in order. Da Vinci was methodical in his research, carefully recording his observations and theories + methodically me·thodi·cal·ly She methodically put the things into her suitcase