His methods were progressive too, or at least progressive enough.
The second method is progressive scan, which means that each line is painted sequentially.
A set of methods to produce MSAs while reducing the errors inherent in progressive methods are classified as "iterative" because they work similarly to progressive methods but repeatedly realign the initial sequences as well as adding new sequences to the growing MSA.
Because progressive methods are heuristics that are not guaranteed to converge to a global optimum, alignment quality can be difficult to evaluate and their true biological significance can be obscure.
One reason progressive methods are so strongly dependent on a high-quality initial alignment is the fact that these alignments are always incorporated into the final result — that is, once a sequence has been aligned into the MSA, its alignment is not considered further.
Within schools "progressive" teaching methods are being discouraged, and there is more of a focus on basic literacy and numeracy.
While the other two methods are not designed to detect progressive gene pairs, which leads to the RS values all close to 1 with little significance.
Many methods are available for the assessment of T1, but the faster methods (progressive nutation) are vulnerable to error due to radio frequency field inhomogeneity and mis-set pulses (Gowland and Stevenson, 2003; Parker and Padhani, 2003).
The Scout method is a progressive system designed to achieve these goals, comprising seven elements: law and promise, learning by doing, team system, symbolic framework, personal progression, nature, and adult support.
