The transition from one level to the next is seamless, consisting mainly of added Conventions which require very few changes.
Throughout, the essence of a natural bidding system with 5-card majors is maintained.

I. BASIC LEVEL   Bidding Guide - Solo bidding
Characterized by three defining features :

1.
1NT = 16-18 pts
This maintains the symmetric division of 3-pts segments of the original Standard system : 10-12, 13-15, 16-18, 19-21, 22-24, 25 -27

2.
"Short 1♣" Opening bid
So that 1♣ is the only ambiguous opening bid (possibly with only 2 cards in the suit), and 1♦ always promises at least 4 cards in the suit.

3.
Suit raise responses
1♥ → 2♥ = 6-10 pts (weak raise)

1♥ → 3♥ = 13+ pts (Game force raise)

1♥ → 4♥ = 6-10 pts, 4+ trumps, unbal. (Pre-emptive Game raise)
Wit 11-12 pts bid a new suit first, then raise to 3♥

The 3-level Game force raise allows 3NT to be used as Blackwood. It also leaves bidding space for the Multi Cues of the higher system levels.
The Pre-emptive Game raise response complements the Splinter raise of the higher system levels.

Additional Basic lessons are : Overcalls & Take-out Doubles, the Losing Trick Count, Weak & Strong 2 Openings, Bidding by a Passed Hand, Negative Double, Pre-emptive Openings

II. INTERMEDIATE LEVEL   Bidding Guide - Solo bidding
Characteristics include three new features :

1.
Power 1NT = 17-20 pts and Crowhurst 2♣ (Opener = 11-16 pts)
This enables Opener to specify his hand within 2 pts over the entire range from 11-27 pts.
It includes transfers to the majors and Modified Stayman where Opener replies at the 2-level with 17-18 and at the 3-level with 19-20.

2.
Multi-2♦ Opening

Includes

Weak 2 (6-10 HCP) in ♥ or ♠

2NT = 21-22 pts

4441 hand shapes with 17+ HCP

This makes three more 2-level bids available for other Opening bids.
It also cleans up the Game force 2♣ Opening bid.
The purpose of the Multi 2♦ is to make the bids of 2♥, 2♠ and 2NT available as Opening bids for other types of hands, as defined below.

3.
Weak 5-5+ suited hands with 6-10 HCP
2♥ = Hearts and another suit
2♠ = Spades and a minor suit
2NT = both minor suits

This system level now provides individual Opening bids for most unbalanced and semi-balanced hand shapes with 6-10 HCP (and ≤ 7 losers).

Additional Intermediate lessons include : Splinter raises, Asking for Aces, Kabel 3NT, Game Try Double, Support Double, Roman Keycards, Multi Cues

III. ADVANCED LEVEL   Bidding Guide - Solo bidding
Three new features define this level of bidding.
From now on Responder shows his points first before showing his suit.

1. (Facts)
2♦ = 13+ pts, Game Force Response (GFR)
2♣ = 10-12 pts, Game Try Response (GTR)
(With 10-12 pts and a new major, bid the major first, then bid 2♣ next)
All other bids are weak with 6-9 pts (or 10pts and ≥ 9 losers)

Suit raises :

1♥ → 2♥ = 6-10 pts, 3 trumps (weak raise)

1♥ → 3♥ = 6-10 pts, 4+ trumps, usually 8 losers

1♥ → 4♥ = 6-10 pts, 4+ trumps, unbal. (Pre-emptive Game raise)

2. (Facts)
Cue bid raise Response (after RH Opponent's Overcall)
1♥ → (1♠) → 2♠ = 10+ pts and 3+card ♥ support.
Direct suit raises are weak as shown above.
2♣* GTR and 2♦* GFR both apply as normal.
    * but without a trump fit in Opener's suit

3. (Facts)
Truscott 2NT Response (after RH Opponent's Take-out Double)
1♥ → (DBL) → 2NT = 10+ pts and 3+card ♥ support.
Direct suit raises are weak as shown above.
2♣* GTR and 2♦* GFR both apply as normal.
    * but without a trump fit in Opener's suit

This sytem level reflects the modern style of bidding (showing points first) and is of a rather aggressive nature, making it difficult for the Opponents to compete effectively.

Other Advanced lessons include : Balancing, Fourth suit Forcing, Long suit Trial bid, Michael's Cuebid, Very Unusual NT Overcalls, Quijote 2♣ Rebid, Brozel against 1NT