Stage 1 Stage 1 POS Stage 1 Engineering R&D Stage 1 Engineering S&W Stage 2 Stage 2 POS Stage 2 Engineering R&D Stage 2 Engineering S&W Stage 3 Stage 3 POS Stage 3 Engineering R&D Stage 3 Engineering S&W Stage 4 Stage 4 Preliminary POS Stage 4 Engineering Stage 5 Stage 5 POS Stage 5 Engineering R&D Stage 5 Engineering S&W Stage 6 Stage 6 POS Stage 6 Engineering R&D Stage 6 Engineering S&W Stage 7 Stage 7 POS