One year ago, Mack and Schroer captured in this column1 the current crisis faced by software security quality control:

This paper considers a range of stochastic models which give the same reserve estimates as the chain-ladder technique. The relationship between the models described by Renshaw and Verrall (Renshaw, A.E., Verrall, R.J., 1998. British Actuarial Journal 4, 903–923) and Mack (Mack, T., 1993. ASTIN Bulletin 23, 213–225) is explored in more detail than previously. Several new models are suggested and...

In a Perspective, Mack Su and David Fisher discuss the development of immunotherapies for treatment of melanoma and other cancer types.

I point out that Mack and Rock manipulated both expectation and attention and suggest that their results ('inattentional blindness') may have been caused by lack of expectation rather than lack of attention. This alternative reading of Mack and Rock's results is supported by other findings, which suggest that 'pure' manipulations of expectation produce 'blindness' whereas 'pure' manipulations o...

This note contains a discussion of the paper of Mack and Venter (2000), and also refers to the paper of Verrall (2000) (both in this issue). The issue is the relationship between the over-dispersed Poisson (ODP) model of Renshaw and Verrall (1998), the distribution-free stochastic model (DFCL) of Mack (1993) and the chain-ladder technique. For a full understanding of the chain-ladder technique,...

It is shown how the distribution-free method of Mack (1993) can be extended in order to estimate the prediction error of the Chain Ladder method for a portfolio of several correlated run-off triangles.