How to do (and what to expect from) early stage customer development
blog.thestartuptoolkit.com
blog.thestartuptoolkit.com
For anything which takes longer than one meeting/call (e.g. everything a startup does in the early days) or which has a high value, though, ABC is actively counter-productive.
Neil Rackham did an awesome job of debunking most of the myths about hard closing in 'SPIN Selling', which is the only book on sales I've ever gotten real value out of.
Going over to devour his blog...
Thanks!