We've just had a lovely chinese au pair join us. She's not here specifically to teach the kids chinese, but we'd like to give her a bonus if they do actually learn something (within 6 months; she may not be able to stay longer). However this means we need to give her a 'target' so she knows what she's 'working' towards. the kids are 3 (with a very basic understanding of chinese already from a previous au pair who used to speak it), and 6 (effectively no chinese). We're only focused on spoken word at the moment.
Any idea where i can find something/one that would be suitable to assess young children's level of chinese, and is 'definable' in terms of a target to the au pair. Central london based....
TIA