The Shorter Catechism was presented to Parliament, and printed, without proofs, in November 1647. The proofs were not presented, however, till the following April. During this time the proofs for both Catechisms were dealt with, those for the Larger Catechism between 7th December and 1st March, those for the Shorter Catechism from 2nd March till 12th April. There were three committees to prepare those for the Larger, and only one committee on those for the Shorter Catechism, yet the latter took much shorter time. This was doubtless due to the fact that the proof texts for the Larger Catechism were there, and merely needed modification because of the lack of complete parallelism between the two, and the omission of some statements from the Shorter one.
The character of the changes can be judged by the study of the proofs for a few questions which agree in the two catechisms. In Q. 1 they omitted John xvii. 21-3, a passage which only indirectly and inferentially proves that man is to enjoy God for ever. Q. 7 of the Larger corresponds to Q. 4 of the Shorter Catechism. The proofs as to God's glory, blessedness, perfection, all-sufficiency, incomprehensibility, and some other points became irrelevant, since these points were omitted from the answer in the Shorter Catechism. Strange to say, Exod. xxxiv. 7 is needlessly (though not irrelevantly) added to the previous verse as a proof of God's goodness and truth. Q. 5 of the Shorter Catechism omits I Cor. viii. 4, 6, seeing in the other two passages adequate proof of the answer. In Q. 6 they trust to the dubious I John v.7 and to Matt. xxviii. 19 for proof of the Trinity, omitting other texts at least equally good (Matt. iii. 16, 17 and 2 Cor. xiii. 14), as well as the insufficient John x. 30. On the decrees of God (Q. 7) they retain two passages as sufficient (Eph. i. 4, 11, and Rom. ix. 22,23), omitting the less manifestly relevant Rom. xi. 33, Rom. ix. 14, 15, 18, and the superfluous Psalm xxxiii. 11. In Q. 9 the statement of the Larger Catechism (Q. 15) that God made all things for Himself is omitted, and with it the need for the proof from Prov. xvi. 4.