An introduction to and the origins of the right of individual communication contained in the Optional Protocol to the International Covenant on Civil and Political Rights; the Human Rights Committee; the operation of the individual communication procedure; inadmissibility ratione personae; inadmissibility ratione loci; inadmissibility ratione temporis; inadmissibility ratione materiae; non-substantiation and no claim under article 12 of the OP; anonymity, abuse and the right of submission and no "fourth instance"; inadmissibility under article 5(2)(a) of the Optional Protocol; inadmissibility under article 5(2)(b) of the Optional Protocol; fundamental procedural issues; final views of the committee; reservations; final remarks.