The 18 Postures/Movements
1 Tai Chi start
2 Opening the chest
3 Rainbow dance
4 Rolling the arms (repulse monkey)
5 Separating the clouds
6 Rowing the boat
7 Lifting the ball
8 Turn and look at the moon
9 Turn waist to push palm
10 Cloud hands
11 Punching
12 Flying goose
13 Rotate the wheel
14 Push the wave
15 Flying dove (pigeon)
16 Scoop the sea then look at the sky
17 Bouncing the ball
18 Balancing Qi (Finish)
The above structure and terminology follows Michael Tse's book - Qigong, for Health and Vitality (1995) isbn 0-7499-1336-3
In 1992 he launched Qi Magazine and Tse Qigong Centre and clinics in Harley Street and Manchester.
Different authors may use different terminology/descriptors of the postures and variations in execution and order of performance exist.
Click the link below for an easy to follow, illustrated, online guide to Shibashi
http://www.corporatetaichi.com.au/shibashi.pdf
Everyday Tai Chi has very useful information. - click here
Ronnie Robinson demonstrating Shibashi