Also, you might benefit from reading this paper: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.25.238 http://citeseerx.ist.psu.edu/viewdoc/summary?do

Also, you might benefit from reading this paper: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.25.238 http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.25.2... The original block-structure implementation in Algol is still accessible in Pascal and Oberon literature.