This tendency of Collado's to retreat from the challenging problems left unresolved by Rodriguez constitutes the greatest weakness of his description. Given concise grammatical descriptions on the one hand and over-simplified versions of previous works on the other, the _Ars Grammaticae Iaponicae Linguae_ unfortunately falls among the latter. In his shorter work, the _Arte Breve_ of 1620, Rodriguez retains the same general format, but makes every effort to reduce the description to its barest essentials. Thus: BOOK I A General Note on the Language 1-2 An Essay on How to Learn the Language 2v-6 The Orthography 6-8 Composition of the Syllables 8v-9v The Way to Write and Pronounce the Letters 10-12v The Declension of Nouns 13-18 The Conjugation and Formation of Verbs 18-52 {14} BOOK II The Rudimenta 52-59v The Syntax 59v-66v BOOK III The Written Language 67-75 The Various Kinds of Names 75v-98v Of particular interest in the context of Collado's grammar is the manner in which Rodriguez displays the verbal system. While the _Ars Grammaticae_ presents the verbal system as a series of alterational rules to be applied to the base forms, the _Arte Breve_ goes even further than the _Arte_ to differentiate the formational rules from the conjugational displays. Rodriguez tries several devices to elucidate his material. For example, Charts A and B below represent very early attempts to use a bordered format for linguistic description. In order to indicate the differences to be found between the descriptions presented by Rodriguez and Collado, I have extracted the formational rules from the _Arte Breve_ and, setting aside only two short appendices dealing with variant forms, present them here in their entirety. _THE CONJUGATION AND FORMATION OF THE TENSES AND MOODS OF THE VERBS_ _All the verbs of this language may be reduced _(se reduzem)_ to four affirmative and three negative conjugations. This is because the negative conjugation of the adjectival verb, which we discussed before,[11] agrees with the second of the three conjugations; and the conjugation of the substantive verb _Sǒrai_, _Sǒrǒ_, or _soro_, which is an abbreviated form of _Samburai_, _samburǒ_[12] both in the affirmative and the negative is reduced to the third conjugation. At this point we will treat the three affirmative and three negative ordinary conjugations of the regular personal verbs.[13] Following this, and on account of its particular usage and formation, we will discuss the conjugation of the adjectival verb._