* ease of being handwritten

If you find it hard to write, it seems there’s a more cursive version, with rounded angles: http://upload.wikimedia.org/wikipedia/commons/1/17/Mandombe_Sample.jpg

  * ease of being typed

If it’s ever encoded, you should simply type the consonants and the vowels, and perhaps a few modifiers. The rendering engines should be able to handle it rather easily: it’s only a matter of glyph substitution, and perhaps also of reordering. Mandombe doesn’t seem very difficult. I’ll try to describe it without using the strange terminology they’ve provided in their proposal. There are 5 basic consonants and five basic vowels. The consonant and the vowel are drawn on each side of an S-like element. A reversed S before the consonant marks the prenasalization of the consonant. There are two additional signs for the liquids. They are written just before the vowel element which is then inverted. There are also diacritics used to write the second part of diphtongs or the nasalization of vowels. By a 180° rotation or a mirror (either horizontal or vertical) of the whole syllable, you get 15 new consonants.
That’s nearly all, folks.

  * speed of being read

I think it’s only a matter of practice.

  * likelihood of confusion of individual characters/letters/symbols
    (in either production or recognition)

It seems the vowel part of the syllable is easily recognizable thanks to its shape and, as soon as you get used to the system, you can easily identify the consonant by its position and the way it is linked to the rest of the syllable.

  * 1-to-1-ness of the mapping between orthographic representation and
    phoneme string

I’ve found no ambiguity in Mandombe.

JF

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